Git is a version control system developed by Linux Torvalds in 2005 that became tremendously popular thanks to services such as GitHub, Bitbucket or GitLab and its wide acceptance in essential projects such as the Linux Kernel, Android, Ruby on Rails, Eclipse, GNOME, KDE, Qt, Perl or PostgreSQL or by companies such as Google, Facebook, Microsoft, Twitter, LinkedIn or Netflix.
If you are a programmer, web developer, system administrator, designer... it is very likely that at some point in your work, you will come across a project where you have to collaborate with other people using Git. Maybe you work alone, but you want to keep track and control of your work. In these two cases and many more, more or less in-depth knowledge of Git will allow you to be much more productive in your career and, above all, avoid many of the problems that people who do not work with a version control system often encounter.
If your field of work is technical and you don't use Git yet, when you've been using it for a few months, you'll wonder how it's possible that you haven't started using it before.