When using this site, it is quite important to be able to find posts on this site which might be related to the question I am interested it - both to avoid duplication (i.e., not asking again questions that have been answered before) and to be able to access useful information already present on the site. However, this task is often quite difficult.
What are good ways to search on this site? Are there some tips and tricks and useful tools which should I know to search efficiently?
This post is made with the intention to create a community-maintained FAQ about search. (In particular, a post on meta is easier to edit and update than something in the help center.)