There are a few ways, you can work for the company on a freelance level, take part in bounties / airdrops. It really depends on how deep and how much you want to earn out of crypto.

If you are looking for a cool platform, look into Crowdholding, they are a co-creation platform were you log in, give feedback to tasks and earn tokens for your feedback. I prefer it to bounties and airdrops because I feel I am contributing more rather than just spamming social media sites. They have over 30 crypto projects on there as well, so plenty to do and earn!

https://www.crowdholding.com