For me, all are shitcoins, only bitcoin is different.

But from your standing point, you are asking how to recognize scam or shitty projects.
Well, here's what I can share from my experience:
1. If website has golden logo/is golden color in 99% is a scam because it's old trick (i can remember xaurum)
2. If project has too big supply (usually over 1 billion is too much) it's a shitcoin
3. You can check team members on linkedin, if they are not there or anonymous - it's a shitcoin
4. If they have thousands of followers on social media and less than 2000 hodlers - usually a shitcoin
5. If they over promise and cannot deliver - a shitcoin

I can type many more reasons, this is straight from my head, cheers!