Invest on the platforms of leading IDOs. If I were you, I would not trust IKO or IEO on weak exchanges, and it is quite difficult to get into IEO on large exchanges.
Therefore, it makes sense to think about reducing risks by taking part in proven projects that are guaranteed to bring profit to everyone who happened to take part in sales. IDO is now showing wild results.
A common and well known rule in finance - anyone guaranteeing profits, is a scam. Nothing is certain under the sun, and that's the thing many new investors don't know about but fall under hype marketing tactics guaranteeing profits, dreaming that "this is the thing that will change my life, because it's the next Bitcoin". Just to find themselves in the end holding illiquid tokens or being investors of effectively a simple landing page + some smart contract purchased & modified for $100-200. So just a friendly advice - be very careful with such things.