Tips

Look at the commit a change was part of from Annotate with Git Blame.

Postfix completion allows you to keep typing forwards, it minimises the amount of time you spend moving the cursor around while you're coding.

Refactor your code and introduce a new variable right when you need it.

Sometimes inlining a variable can make your code more readable.

Generate a new test class from your Java class.

Use CamelCase in code completion to speed up your workflow.

Using language injection to work with SQL.

Use IntelliJ IDEA's inlay hints to navigate to Related Problems.

Using language injection to work with Regex.

Use Live Templates to auto-complete common code structures for you.

IntelliJ IDEA can help create code for you saving your fingers.

You can view a wealth of information about your code in the scrollbars.