Can you use Stackexchange for Link building?

Hi! I am quite new to link building, and I know people use Q&As like Qoura and Reddit for marketing and getting relevant links. I can see that links on Stackexchange can even be do follow if the account is trusted and you have upvotes. Though, no one seems to be selling such services or discussing this way of link building. Does it make sense?

Yes, it makes good sense to have a StackOverflow backlink to your site if it's relevant and promotes your services or product that you code for, or business you are connected with. I wouldn't use it to advertise a weightlifting amazon affiliate accessories site for example.