Is there a list that defines what every color in the Intellij Idea scrollbar (right of the screen) means?

You can find/change it in <code>Settings</code> | <code>Editor</code> | <code>Color Scheme</code>, <code>General</code>: <img src="https://i.stack.imgur.com/GrAKN.png" alt="general"> Look for the elements that have Error Stripe Mark defined, these are: <ul> <li>Error</li> <li>Warning</li> <li>Weak Warning</li> <li>Problem from Server</li> <li>Identifier under caret</li> <li>Text search result</li> <li>TODO (default one, can be customized in <code>Settings</code> | <code>TODO</code> per pattern).</li> </ul>