Crypto's are new digital money and it's trying to compete those existing currencies that are already being used by different industries worldwide.
If you have learned about it few years ago, you have an idea on how it has grown for the past years. We're the same, I've heard and learned it years ago too but I wasn't so curious and I didn't acquired any of it before.
Only btc, eth are the main currencies currently recognized by many.
When we say crypto, it's recognized as a whole.
The other currency on the market is just shit or not worth the shjt
Yes, most of ICO tokens and coins are all like that.