There are different reasons to save a coin. My favorites are die varieties:

So there are die varieties, error coins, Die events, Striking events and even coin events. The differences?
1. A die variety is has an issue with the way the die was created. If the hub creation is not normal, then it could be a die variety. a Doubled die, or RPM on to pre-1989 coins. Year ago there were even more different types. But what makes the other ones different than the other on my list, it this: Each coin will show the same variety because the variety is on the die.
2. A mint error: These are one of a kind happenings. The metal was not correct, the strike was not correct, the But they are usually a one of a kind event. Some of these can be worth a lot more than you can imagine.
3. Die events: Die events that show die aging, die cracking, die chipping, die breaks, rim
Cuds,
Die Cuds, split dies. Things that the die goes through often. Not like the one of a kind event a mint error is. New ones get interested in them for a time and eventually realize they are just a die event, and sometimes 54% of that dies run will show show these as they age.
4: Striking events, such as
Machine Doubling,
Struck Through Grease, oil, debris, card board, that will alter the devices. Making them go away when the devices are blocked out totally. Smeared in any direction possible after the strike by a loose machine.
5. Coin events. These are not mint errors. They happen to the coin after the coin is struck. People doing all kinds of unspeakable things to these coins. Cut, chopped, dipped in acids, heated, stained, scratched, plated, painted,
shot, drilled, smashed, tossed in a parking lot, squeezed in a vise. Sanded, and the list goes on and on. The coin events, drop the value to just face value. Just like damaging your can does not make it worth more money, damaging a coin does not make it worth more. If it did, then there would be no change at all. It would all be damaged.
1. Varieties are not the most expensive coins, but to me they have a purpose to learn and study/
2. Are the most valuable, but they are the most rare to find. Especially the high dollar ones.
3-5 are more or less just face value coins. Sure there are some that have a little value, but the 4 die events & 5 coin events are the the least valuable. But in order to find the #1 and # 2, you need to learn which ones are which. If I were to post images of all the ones mentioned, it would take me a week to add them all to the thread. So where are you at this point? Probably at the 3-5 levels. It takes a long time to train your eyes to what is what. So take some time to figure out the ones to spend a few seconds on, and these will will be ones you will find for some time. So don't give up. Keep in mind, the more valuable the coin is, the harder it is to find. But people come on there and have a gem and don't even realize it. So take your time. Allow your eyes to be trained on what you are looking at. A good place to start?
CoopHome. Note how it turns blue? It will take you to a thread with a lot of threads and thousands of images. On these thread, it is not at page 7, and getting close to page 8. Or you can ask questions. "What is this?" A question not often asked. Sometimes people come here convinced they have the holy grail. But they have a coin cent coin. (#5) So ask questions. We will assist you to see what have, and if I'm there, keep in mind the way I teach. When asked about a coin, I mention what I see on their coin. Point out specifics about what you are seeing. Also keep in mind, that several events can also happen to a coin, not just one event. Welcome to the forum. Your brothers and sisters are here to help you.
Another point. Note on the forum threads you will see the blue letters with the under lining. Click on the word/term and it show open a new window, with information on the subject. Read these. That will help you into the accelerated classes. But go at your pace.