Here's a good method

Sort coinmarketcap.com by "trending > recently added"

Look for coins with the highest trade volume. Those are the ones people likely more informed than you know about and are buying.

If a coin has high volume and looks interesting to you, click through to its website, read its whitepaper, then trawl the internet looking for information on it.

Buy the coin

Wait a few days

Seriously, just wait

Profit

in addition be sure to verify the trading volume makes sense with the market cap.

If market cap is 50 million but the 24hr trade volume is 70 million then it's more than likely a pump group, whale, etc. trying to manipulate the coin. This is why i hate that worldcoinindex.com sorts coins by 24hr trading volume. The volume really doesn't serve any real purpose other than knowing a coin isn't dead.