You can mark questions in the Stack Exchange network simply by clicking the little star icon. A yellow star means you’ve marked it as a favourite, a grey one means you haven’t. It’s a convenient bookmarking system.
But where can you see a list of what you’ve starred? It’s not exactly obvious, so let me show you how to access your favourited questions and up voted answers. I’m using Stack Overflow as an example, but the principle is the same on all Stack Exchange sites.
- head over to your Stack Overflow profile (click on your badge at the top)
- find favorites at the bottom
- now select added to see your starred/favourited questions
- or select votes to see which answers you’ve up-voted
Hope this helps!