There are some factors that need to Notice before Investment on any Altcoins.
Market cap of that Coin
24h volume of that coin.
Maximum supply of coin
Blockchain Technology that Coin is using.
Globalization
Community behind that Altcoin
Whitepaper
Liquidity
If I missed anything then include this in this Topic
most of them already in the list you mentioned.
and it is true, before starting invest should have to know the basic theory first and then practice it