I’ve done my research but still clueless on what to buy

I know it’s not recommended to ask that but I don’t really have a choice.

Everyone tells me to DYOR and I did that. I know what cryptocurrency is and how it works. But I’m still worried I might make a bad decision and buy something that’ll tank.

I only know that BTC and ETH are good first options and in the long run.

What other coins/tokens would you recommend me as a first time investor? My initial budget is 300 Euros.

How many different coins/tokens I should have? I don’t want to spread too thin.

Also allocation too. How should I allocate my crypto? Some say 40% BTC 40% ETH and rest in other coins/tokens.

Any advice would be helpful.