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IntelliJ IDEA lets you know that it has suggestions for you with a light-bulb on the left-hand side of the code. This light-bulb is red for errors, and yellow for other suggestions.

If there's an error in the code, pressing ⌥⏎ (macOS), or Alt+Enter (Windows/Linux), can suggest options that will make the code compile.

If there's a warning, IntelliJ IDEA will show you what the warning is, and may offer one or more suggestions on how to fix that warning. These warnings are often from inspections running on the code.

Even if the code is working perfectly well, pressing ⌥⏎ (macOS), or Alt+Enter (Windows/Linux), will often show suggestions on other ways to express this code. These suggestions can help us to reshape the code, for example to make it more readable, or as part of a larger refactoring towards some other pattern. These suggestions can often be configured via intentions.

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While you're coding, you may want to jump to the next error or warning (F2) or the last one (Shift+F2). This way, you can quickly hop to the next thing that needs fixing or addressing without having to move your hand to the mouse.

Combine this with ⌥⏎ (macOS), or Alt+Enter (Windows/Linux) to quickly see the suggested solution to the problem and apply a fix. This will show a list of suggested solutions, as we saw in the tip about Alt+Enter, and we can pick the solution that suits us best.

If you're confident IntelliJ IDEA has the correct fix for the problem, you can skip the step of listing the solutions. Press F2 to navigate to the problem, then press ⌥⇧⏎ (macOS), or Shift+Alt+Enter (Windows/Linux), to accept IntelliJ IDEA's suggested fix.

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