My startup disk is full; How do I find "other" - 62.82GB's?

I have a few simple rules for people who aren't Mac experts:

1. Leave the System and Library folders alone. Anything deleted from them could leave your computer unstable or unable to boot up.
2. There are some programs in the Applications folder that are installed by Apple - they should be left alone. Others are okay to delete assuming you don't need them. If you aren't sure, leave them alone.
3. Inside your own folder there's a Library folder too. It isn't as dangerous to delete things from it as the main Library but doing so could leave one of your programs unstable or non-functional.
4. Everything else in your own file space is fair game. Keep in mind that word processing and similar files are relatively small and deleting them won't create much space. I could delete everything in my Documents folder (and it has a lot of stuff in it) but it wouldn't free up as much space as deleting one movie. Media files, movies, videos, music, and digital photos are large and deleting a small number of them will free up the most space.

Here is the definition of OTHER:

https://support.apple.com/en-us/HT202867

It perhaps should be named 'miscellaneous'. This should make dwb's good advice a bit more meaningful.

Ciao.

Any thing that you off load to an external HDD also needs to be backed up, if you value it. Many people often forget that. 🙂

Ciao.