Main methods:
Read the white paper (Whitepaper) – this is a document that describes the project.
Look at the team – if the project has good developers, that's a plus.
Analyze the community – active participants talk about prospects.
Follow the news – announcements about partnerships and updates can affect the price.
Evaluate trading volume – if a coin is being bought a lot, it's a good sign.
Examples of successful altcoins
Solana – in 2021 it cost $2, and then rose to $250.
Shiba Inu – started as a joke, but brought investors thousands of percent in profit.
SOL
103.32
-5.28%
SHIB
0.0₅516
-5.14%