How to become Good back-end developer?

Here some point to be noted being a good back-end developer .

1.Read the official documentation carefully of language .
2.Each topic are important for being a good back-end dev.
3.If any bug makes you unhappy take a short break than thin about problem it will help you to resolve bug .
4.Check your syntax twice and than run program .
5.Always find bug from initial to advance .
Thanks .