What I learned as a hired consultant to autodidact physicists (2016)
His customers could just post on stackoverflow instead:  <a href="https://physics.stackexchange.com/questions/tagged/general-relativity?tab=Votes" rel="nofollow">https://physics.stackexchange.com/questions/tagged/general-r...</a><p>I went down a rabbit hole there looking into numerical methods for general relativity.