You can also double click a word, keep the mouse button down, and drag. This will select whole words. I use this a lot.

I didn’t know that either, thank you! It works with triple-click paragraphs too.

Along the same lines for text navigation and manipulation:

opt + [arrow keys]: To move through text respecting word boundaries.

cmd + [arrow keys]: To move through text respecting line boundaries.

Add shift to either of those and now instead of navigating, you're selecting the text.

opt + delete: deletes full word behind cursor

cmd + delete: deletes full line behind cursor

This is same in Windows and Linux as well

This feature is present everywhere.

Windows, Android, all browsers I use, inside apps, etc