Definitely as mookie and pokken mention, the absolute best way to get good at graveyard strategies is to try and play on more marginal graveyards for your value if you can.
Examples are when you have dredge outlets is making sure that you can use them later. I play a lot of
Life from the Loam decks, and once the game has gone on for a little while, there are two main things that I'll do. Firstly I will almost always make sure that I don't expose the "dredge" card to removal itself. This means either not leaving it in your graveyard OR having a way to draw at instant speed so that I can dredge in response.
During the early game this isn't always possible, but once I have dredged numerous times then it should be a priority so that if your graveyard is removed, you can start the dredge plan again.
The second thing to assess is whether you have enough resources in your graveyard to function. You'll always want more of course, but really the better player will see if they can get enough value from what they have already.
For example you might be able to recur one creature every turn (somehow). This creature might only be able to effect the game in one particular way. You might have multiple creatures in the deck that can toolbox your way through many situations. But I'll access if this creature (or creatures) I already have access to will be enough to grind value.
For example let's say I have
Caustic Caterpillar as a creature I can recur each turn. If I have the option to not expose my graveyard further by putting more cards into it, where I know that the
Caustic Caterpillar is going to grind my opponents out of getting the traction that they want, then you just don't need to unnecessarily do it. It feel a bit weird because you know that your deck is capable of doing quite powerful things if you were to go further with the graveyard plan, but if what you have is "good enough" then just be patient and keep using it, even if it's not the most busted thing your deck can do.
This comes up a lot with mass reanimation as well. If you wait a turn then you'll likely get double the value. Wait another turn and you might get like quadruple the value.
Don't get me wrong high risk high reward can win you a lot of games. But invariably as I get more experienced, I'll always pull the trigger at the
first opportunity rather than wait for higher returns.
I'm not a huge fan of shuffling your graveyard into your library to "save" it, as really this can be just about the same result as it getting exiled anyway. Sure there might be some cool cards that you'll lose forever, but in a format of 100 cards, you'll have others to get. Honestly unless you really are a combo deck that truly relies on a couple of key cards, then I wouldn't put much stock into it.
But as mentioned getting an
Kozilek, Butcher of Truth or
Ulamog, the Infinite Gyre into your graveyard can do this, and
Survival of the Fittest is great at doing this.