Git best practices

There is a wealth of info on the web, but as Skunkbad implies, you'll probably be better off paying for a good tutorial.

That said, this is probably the best free one to start with.
The tutorialspoint site is a bit more friendly than the above.
And then there is Learn Enough Git to Be Dangerous.

You will want to understand and be able to use the command line. When all is said and done most of the time you only use a few commands. If you do go looking for a GUI tool then take a look at GitKraken. It will run well on your new laptop.