Git for testers

Push. Pull. Commit. Branch... - Are you developing in master or in the branches? - How much commits in githab do you have? – Did you pull the new changes? At once tester met with all of these. Will it be with joy or with horror -depends on has he ever heard these words before, or knows what they mean. So, Git. Why tester needs it? What is a branch? How does it work and what basic commands do you need? The speech will be useful for testers who have never faced with git before, but want to know what it is. It will be more useful for testers who need git and they have already started to study git, but they "downloaded the book, and it is large and in English". Testers which are working with git successfully for a long time – I invite just to talk and share experiences ;)