A mechanical keyboard is one where each key sits on its own independent physical switch, and that switch closes the circuit itself when you press it.
That single sentence separates two entirely different products that happen to look alike on a desk. The keyboard in a cheap laptop, and the one bundled with most office desktops, is a membrane board. Under the keys there is a sheet of rubber domes sitting on top of two plastic membranes printed with conductive traces. Press a key, the dome collapses, and the two membranes touch at that one spot. The dome is what pushes back, and the dome is what eventually splits or turns to mush. Every key shares the same sheet, so one dead spot can take neighbours with it.
A mechanical board does not work that way. Each key gets its own self-contained switch, a plastic housing with a stem, a metal spring, and metal contact leaves inside. The spring is the thing you feel, not a rubber dome, and the contacts are sealed inside the housing rather than printed on a shared sheet. Kill one switch and the rest of the board keeps working; you desolder or hot-swap the offender and move on. That modularity is the whole point, and it is why people who type for a living keep coming back to these boards after a membrane deck has died on them.
Understand what the switch is actually doing
The switch is a mechanical relay you operate with your finger, and its internal geometry decides everything about how the board feels and sounds. The common designs split into a few families. Linear switches travel straight down with no bump at all. Tactile switches have a small detent partway down that tells your finger the press has registered before you bottom out. Clicky switches add a separate click mechanism, usually a small sliding jacket, that produces an audible snap in addition to the tactile bump. None of this is electronic trickery; it is stamped metal and moulded plastic doing exactly what its shape says it will.
Actuation force matters more than most buyers expect. A light switch, in the range where you barely feel resistance, is comfortable for long typing sessions and miserable for someone who rests heavy hands on the home row, because stray presses show up as unwanted characters. A heavy switch tires fingers over a long day but gives unambiguous feedback. There is no correct answer here, only the answer that matches your hands, which is why buying a switch tester before committing to a full board is money well spent rather than an indulgence.
Travel distance is the other lever. Some switches actuate near the top of the press, so a light touch is enough. Others require you to push most of the way down. Shorter travel feels faster and suits rapid gaming inputs; longer travel gives more room for the tactile event to be felt. A switch that actuates almost immediately can also fire on a accidental graze, which is exactly the failure mode people complain about when they blame the board for typos they made themselves.
Hot-swap sockets deserve a mention because they change the economics. On a soldered board, changing switch type means a soldering iron and an evening. On a hot-swap board, it means pulling the old switch with a small extractor and pressing a new one in. That turns switch choice from a permanent commitment into something you can revise, and it is the single feature most worth paying extra for if you are unsure what you like.
Choose a board by what you will actually do with it
Start with size, because layout determines whether the board fits your desk and your muscle memory. Full-size boards carry a number pad, which is genuinely useful for anyone entering figures all day and useless for anyone who is not. Tenkeyless drops the number pad and keeps the arrow cluster and function row. Smaller layouts, the 60 percent and 65 percent classes, cut the function row and sometimes the arrows, then recover those keys through a function layer. That trade is real: you get a smaller footprint and less hand travel to the mouse, and you pay for it with a learning curve and a layer you have to configure.
Then match switch type to use. Linear switches are the usual pick for competitive gaming because there is no bump to push past and no click to mask audio cues. Tactile switches are the usual pick for writing and code, because that detent confirms the press without announcing it to the room. Clicky switches are for people who like the sound and for people who work alone; in a shared office they are a social problem, not a technical one.
Keycaps are the part everyone underestimates. Profile changes the shape of the top surface and how your fingers find keys without looking. Material changes feel and wear: ABS caps start smooth and shiny and develop visible shine on the most-used keys over time, while PBT caps stay textured and resist that polishing far longer. Neither is objectively better, but if you dislike the greasy look that develops on heavily used keys, that is a material issue, not a cleanliness issue, and no amount of wiping will fix it.
Finally, check what the board does when you press several keys at once. Rollover and anti-ghosting are the specifications that describe how many simultaneous presses register correctly. If you play games that need multiple keys held together, or you type fast enough to overlap, this is the difference between a command registering and a command silently failing.
Clean the board without wrecking it
Unplug the keyboard first. That is not a formality; a keyboard with power applied can register phantom input while you work, and a spilled liquid plus live electronics is how a repairable board becomes scrap.
For routine maintenance, the enemy is debris, not germs. Crumbs, dust, and hair work their way under the keycaps and into the switch stems, where they make keys feel gritty or cause a press to stick. Pop the keycaps off with a wire puller, working straight up rather than rocking sideways so you do not stress the stem. On a hot-swap board you can lift the switches too; on a soldered board, leave them in place and clean around them.
Loose debris comes out with compressed air, applied in short bursts at an angle rather than held flat against the surface. For anything sticky, isopropyl alcohol on a lint-free cloth does the job on caps and on the plate. Do not pour liquid onto the board and do not soak the case. If something sugary has actually gone in, the caps can be washed in warm water with a little dish soap and then dried completely, and completely here means overnight, not a quick towel-off, because trapped water inside a cap or a stem will cause problems later.
Reassemble only when everything is dry, and press each key once to confirm it registers before you trust the board with real work. If a key still feels gritty after cleaning, the debris is inside the switch housing, and the fix is replacing that switch rather than cleaning harder.
Winding a mechanical watch is a different problem entirely
A mechanical watch is a timepiece driven by a wound spring rather than a battery, and it has nothing to do with keyboards beyond the shared word. The mechanism is a mainspring coiled inside a barrel. As the spring unwinds it turns a train of gears, which drives the hands, and an escapement releases that energy in small, even ticks so the hands move at a controlled rate instead of spinning free. That is the whole principle: stored elastic energy, metered out.
Winding is where people cause damage. On a manual-wind watch, the crown turns the mainspring directly. Turn it gently, in the direction the watch expects, until you feel resistance rise. Stop there. The spring is now fully wound, and continuing to push past that point is how you break it. A watch that has stopped usually needs a full wind, and a full wind is reached the moment the crown firms up, not after another ten turns for luck.
An automatic watch winds itself from the movement of your wrist, so it usually does not need manual winding at all. If it has stopped and you want to start it, a modest number of turns is enough to get it running and let your arm do the rest; forcing it to full tension by hand on a watch that is designed to slip when fully wound is unnecessary and risks the same damage. If the crown will not turn, or turns with a grinding feel, stop and have it looked at rather than forcing it. The parts inside are small, and they do not forgive impatience.