What is the difference between bounty and airdrop then? I still have doubts...

Generally you shouldn't do anything during airdop, but you have to make some efforts for promotion of the project, when it comes to bounty program

What can I do to promote the project?

It is usually done in social networks or on your YouTube channel, depend on conditions of participation

What should I do to participate and how will they check, whether my promotion gave a result?

They will check number of views, leads, maybe. Better to ask bounty manager about this all in special chat or Bitcointalk topic

Does this project has something from it?

Not yet. Admin told before, that it will appear after the end of private sale. You should be more attentive Wink

Thanks for your detailed answers and kind response