I've mentioned this previously, but the website 'AboutTech" is an excellent source for help with OS X (soon to be macOS) and general Mac questions. Here and here are just two examples. Once on the website, there are more links on the right side one can click for more help. Here's one on Mac Troubleshooting tips. I think the articles are well-written and can be a big help with your Mac questions.
Jim Hamm