There are 2 options to follow a good question in GO.
- Click the Heart icon at right side bar.
- Click the follow button below that question.
Clicking any one of these options available, for bookmark the question in GO which you solved during preparation time, so it's easy to recollect the concepts .
And there is google search bar to help you.
There is tag search option available also.
The person whom you think provide good answers , you can follow him/her also .
With these many options , hope it help you to prepare well.