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
All these info after available within a click away. The most important thing is hype and marketcycle. Hype is definitely an important factor at least for the short term gains. Analysing market cycle is a good thing because you must not trade against the ongoing trend.