People make the mistake of thinking all odd looking coins are collectable coins sought by the coin hobby. A person wanting to find something the hobby is interested in has to know how error coins are made by knowing the minting process and the die making process. Otherwise expect to get fooled time after time (after time after time :D).
ebay and online "get rich quick with this coin!" videos are NOT a source for fact. Funny colors, most weird marks, dents, missing letters, splotches, discolorations, etc. are typical of damage and not collectable errors.
To learn what to look for, the best appraoch is to get a box of pennies from the bank. Sort all coind by date and mint mark. Go to varietyvista.com and, date by date, try to find an exact match. Those are the coins to be looking for as far as doubled dies, RPMs, and OMMs.
Other types of errors are listed at error-ref.com. Reading that site like a book is how to learn errors.
It takes time to know what the coin hobby actually values.