In my opinion, invest in altcoins that have the potential to rise and have interesting projects in the future or that are founded in this light. Avoid altcoins that you don't know what you are buying. Still do thorough research. Do your own research so you don't experience losses. ETH, SOL, MATIC and The top 10 coins on Marketcap are very suitable for beginners but you need to remember that this is a lot of investment advice do you own research