I am familiar with people who also participate in generosity companies. Some of them do not rush to sell received Tokines, others on the contrary, immediately after the issue of tokens the exchange is sold. My friend advised me to send them to EtherDelta. When receiving tokens, place orders for the sale of x2 - x10 (depending on the project) and just wait until they are purchased.
What do you do with the received tokens?
Your friend suggested you to early. If you get your rewards, try to wait for official exchange to listing.
If you sell your tokens in the decentralized exhange like etherdelta, your token price may low.
Most peoples trust centralized exchange.