Get acquainted with the ICO project. Check their website and white paper.
In case of any questions ask them on their Telegram or other social media channel.
Don’t believe ratings on ICO listing sites. It’s pure advertising and most of the ratings are tampered.
Don’t believe article about ICOs in Medium or other platfroms. 99% of them are sponsored.
Don’t trust crypto influencers that are praising certain ICOs. In 99% of the cases they are being paid for this.
Likewise be skeptical if you read bad reviews about an ICO. Usually it’s done by their competitors.
Use only your own judgement when making investment decision.
Don’t be the first idiot to invest in a failed ICO. Check always on Etherscan that people have really invested in this ICO as they claim. Or if the token is based on other crypto, check their blockchain.
If an ICO does not have a smart contract stay away from it, it’s a not a real ICO, but a poorly made scam.
Don’t invest in an ICO that is not getting enough investments, there is a reason why people are not trusting it, even if you don’t know it.
Keep in mind that an ICO is extremely high risk investment even compared with crypto currencies.
If you are not sure in which ICOs to invest don’t invest in them at all. Rather invest in Bitcoin or other major crypto currency. That kind of investment is much safer.