@ywazme_ https://nim-lang.org/docs/mm.html

In general:
- refc - old default memory management ([garbage
collector](https://en.wikipedia.org/wiki/Garbage_collection_(computer_science))
that runs alongside your program), a bit more wasteful on resources than ARC,
ever so slightly more stable
- ARC - automatic ref counting, (deterministic gc, that is applied at
compilation step) you must avoid cycles in your ref objects or it will leak
memory `roughly speaking the memory for a variable is freed when it goes "out of
scope"`
- ORC - new default strategy, essentially it's ARC + cycle collector (O in name
stands for cycle), low overhead over ARC, ref cycles don't leak memory
- none - turns off memory management, use alloc and free (as you would in C),
also most of standard library will leak, so write your own functions (as you
would in C) or just don't use this option
- Boehm and Go - not really supported, better to avoid
- Atomic ARC - not sure about status of this one, could be unstable
- mark and sweep - no idea about support (does anyone use this?)

I would just stick with default ORC, unless you have to use something else and
know what and why.