of course on exchnager, but first that token must be officially listed before tradable on that exchanger, for more info usually go to their telegram page for info about their project itself.
To sell tokens or not, question is now. I didn`t sell any of my tokens that I bought or earned. Buying and selling can be done
on exchange sites that accept token. You said right Ngantrann206, people must follow official telegram group, site or project ANN
thread here on BitcoinTalk for more informations.
In my experience until now everything starts from little exchanges that accept token first. Good tokens later become accepted
by bigger exchanges. I follow news about tokens that I have almost everyday and it`s either that or to try marketplace here on
forum, but be careful there are many scammers, use escrow or let them send tokens first.