[seeyes]

I use wiki for stuff the team would care about. But asking this for personal use. For eg, there might be some git commands that I learned that I want to write down, everyone else may not really care about it/ may already know it.

[davelnewton]

Same answer; wiki, with customization for search.

Lately I use nvAlt, and now I may switch to Quiver (OS X), for a lot of that. I might even switch to Dash (of which there are Linux variants) after I explore its snippets and note-taking capabilities.