Pamir

One thing worth knowing on laptops: some models use a combined headset jack that expects a four-conductor plug.

Plug in a three-conductor pair of headphones and it can behave oddly — one channel, no sound, or the machine deciding a microphone was connected. It is not a fault, it is the connector expecting a different plug.

A cheap splitter or adapter resolves it, and it is worth checking the machine's specification before concluding anything is broken.

One habit that makes debugging much easier: have the firmware print its own settings at startup.

A line at boot saying the baud rate, the firmware version and the build date means the first readable thing you ever see confirms you are connected to the right board running the right code. It costs one line and it removes a whole category of confusion about whether the thing you are looking at is what you just flashed.

Where it genuinely pays, from having done it for years:

• Recall by association. You remember one end of a thing. Following links from anywhere nearby gets you there, which is closer to how memory works than remembering a folder name.
• Ideas that live between topics. The connection between two subjects has no folder. It has a note, linking both.
• Surfacing what you already knew. Opening a concept note and finding six unrelated projects referred to it is genuinely how you notice a pattern.

Where it does not:

• Reference material with an obvious home. Invoices go in a folder. Linking adds nothing.
• Small collections. Under a few hundred notes, search and folders are fine and the overhead is real.
• If you do not write prose. Links come from writing sentences that mention other things. A collection of clipped articles produces no links and no benefit.

That last one is why people bounce off it. The feature rewards writing, and it does nothing for collecting.

The concrete difference is that folders force one place and links allow many, and the cost of that shows up later rather than immediately.

A note about a technique you learned on a particular project belongs in the project folder and in the techniques folder. With folders you choose, and in six months you look in the wrong one. With tags you can have both, which is why tags exist.

What links add on top of tags is direction and context. A tag says these notes share a label. A link says this note refers to that one, and — with backlinks — the target shows you everything that referred to it, without anybody maintaining a list.

That last part is the whole thing. A note about a concept slowly accumulates a list of every context where the concept came up, assembled by you writing normally rather than by you curating. Folders and tags never produce that, because they have no notion of one note pointing at another.