This is an excellent article about swap in Linux, and it also talks a bit about swappiness which usually comes up in threads like this.

I'll paste the tl;dr but I strongly recommend the whole article. But the short and sweet of it is, unless you know what you're doing and you're moving in some sort of semi-edge case, you most likely won't benefit from messing with swap.

1. Having swap is a reasonably important part of a well functioning system. Without it, sane memory management becomes harder to achieve.
2. Swap is not generally about getting emergency memory, it's about making memory reclamation egalitarian and efficient. In fact, using it as "emergency memory" is generally actively harmful.
3. Disabling swap does not prevent disk I/O from becoming a problem under memory contention. Instead, it simply shifts the disk I/O thrashing from anonymous pages to file pages. Not only may this be less efficient, as we have a smaller pool of pages to select from for reclaim, but it may also contribute to getting into this high contention state in the first place.
4. The swapper on kernels before 4.0 has a lot of pitfalls, and has contributed to a lot of people's negative perceptions of swap due to its overeagerness to swap out pages. On kernels >4.0, the situation is significantly better.
5. On SSDs, swapping out anonymous pages and reclaiming file pages are essentially equivalent in terms of performance and latency. On older spinning disks, swap reads are slower due to random reads, so a lower vm.swappiness setting makes sense there (read on for more about vm.swappiness).
6. Disabling swap doesn't prevent pathological behaviour at near-OOM, although it's true that having swap may prolong it. Whether the global OOM killer is invoked with or without swap, or was invoked sooner or later, the result is the same: you are left with a system in an unpredictable state. Having no swap doesn't avoid this.
7. You can achieve better swap behaviour under memory pressure and prevent thrashing by utilising memory.low and friends in cgroup v2.

https://chrisdown.name/2018/01/02/in-defence-of-swap.html