Always be careful if you ask those questions in social media and also here in the forums because a lot of people that will tell you to buy this or that project are not telling you this because they believe that these are the best projects but because they own them themself and want to shill their coin.
It's always the best thing to do your own research. Go to coinmarketcap or coingecko and read through the projects that you think are interesting.
If you are planning to hold really long term than of course the big and estblished projects are the probably the safest to invest in like Bitcoin, Ethereum, Binance, but i guess that is nothing new to you.