OK, let me see what time I can find to do this. Likely to be a rambling tour, but hopefully enough to get you started. BTW, a “pull request” is a way of asking the owner of a repository to merge some changes that you’ve made, but I’ll go through that in detail in the video.
I will say that I’m an old school command line guy, so will be using the command line git tools. There are some nice, much friendlier GUI tools available, but that’s not really my thing, and I think it’s worth learning the underlying tools.