The 50c piece is the only coin that won't id like junk and be loud and big enough to tell what it is. Every other coin has some junk crossover (decimal) so not only will you need to memorize numbers but also how solid vs scratchy and size or target. 1c and up into predecs the id numbers tend to be higher than common junk.
The humble 5c is same id as modern day pull tabs. Trick is 5c pieces sound and scan exactly like 5c pieces but not like pulltabs, but pulltabs will occasionally sound a lot like 5c pieces. Same with $2 coins and screw tops. And the only way to figure that out is practice. I still dig screw tops because of the similarities, but in 95% of these cases I know it's a screw top already. And the reason I do that is because of what you've brought up. Newbies hunting goldies.
When I started out I put a set of numbers on the top of my screen based on air tests Then I learnt the numbers and dug heaps of junk. So then I went back to solid numbers only until being shown deep silvers/ jewelry/ gold being picked up by another shooter. So I went to dig everything mode, and learnt many valuable lessons and info. Now I pick up coins, dig deep odd signals, and any odd number repeatable.
Only one way to learn....time on machine.