People often talk about the fork, but i don't know what that means. Any good links?
https://blog.coinbase.com/what-is-a-bitcoin-fork-cba07fe73ef1?gi=5f8bfde94062https://www.coindesk.com/short-guide-bitcoin-forks-explained/A fork is basically a split of the network, mostly due to disagreements about for example the blocktimes, or sizes ( see bitcoin cash).
What happens is that at a certain moment ( snapshot), the bitcoin chain will split, and another blockchain will be born.
You also have forks that are done by accident, when 2 miners mine a block at the same time, the network will be split aswell, until the next block is mined. ( nodes will accept the longest chain.) The other block will either be orphaned, or rejected.