Full disclosure, I do not know git command line at all. My only exposure to it is only through GitHub and BitBucket. That said, I've been using the GitHub and SourceTree desktop apps for several years, and I have no real complaints. I've built quite a few of my own projects and contributed to quite a few others as well. I've made some stupid mistakes when it comes to contributing, like submitting a PR using the wrong branch, things like that, but I get by.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.