You can check out this, very useful guide to gain understanding on the different technology used in different blockchain
https://mycrypto.guide/Good read.
Top 10 coins are usually good investment coins, but don't expect it to multiply in value in short time frame. Also, these coins will fluctuate a lot in value, so be prepared to hold it for a long time and ignore short term volatility.
Just glance through that material now very interesting. I will take out time to read it. Thanks.