I am sorry maybe you mean ICO not CIO
. You can earn it from bounty campaign and there many ways inside bounty campaign through airdrop, signature campaign, article campaign, and many more. But be careful about scam. To avoid scam you must look the project in their website, is the project good? or not, Is the team be responsible? Is manager bounty success from bounty before? And check whitepaper.
it just shared my experience. I hope this can useful for newbie.