Travis CI was a complete game-changer for me. I learned about it from curiosity about those "build: passing" badges that you see in Readmes. Once I did, it completely transformed how I think about deployment. Travis is a huge safety net for catching bugs in production. It also creates peace of mind when using a tool like Dependabot, because you know that your tests will still have to pass for a new release to get made. It is extremely straightforward to get set up and is also a giant motivator to write tests.
"Just ship, baby."