One thing I use all the time, and have for a decade or two, but which is pretty unintuitive if you don’t happen to discover it:
If you have a ‘File Open…’ or ‘File Save As…’ dialog, or something similar, which is pointing at the wrong directory for you, you can drag a file or a directory into it, which will cause it to change to that directory or file (and select it if appropriate).
I often have a folder open in the Finder and want to save something to that particular folder… but navigating there using the dialog would be tedious, so this is very handy.
Of course, as the original poster pointed out, you could also find this and various other things in my YouTube video of small Mac Tips and Tricks. 