I have too much stuff lol. I went semi-hydro for a bit so I have leca, bonsai mix, and zeolite (zeolite was a bag of ecotraction). I also bought some silica sand (i think it was a bag of pool filter? it was cheaper) to mix into soil to make carnivorous plant medium.

These days I mostly just use potting soil, cactus soil, perlite, and orchid bark. I prefer pumice over perlite since it doesn't rise to the top when you water, but perlite is cheaper. I keep a bag of sphagnum moss for growing alocasia corms, though I've also used leca for that and it works well too.

I grew a bunch of succulents and a caudex plant from seeds in cactus soil, they did well (I also had fungus gnats at the time so I lost some to those).

my caudex plants now mostly live in a 1:1:1 mix of cactus soil (or regular soil if I've forgotten that I use cactus soil for them), perlite, and orchid bark. They're all pretty happy.

I keep vermiculite for more moisture-loving plants, as it releases water for a bit longer than perlite while still providing drainage. My African violet loves it.

Sand is amazing for just drainage and I always add it to cactus and succulent mixes.

Small pebbles (I like lava rocks) have been a must-have for me for a long time. I add them as a top layer for everything. Combined with bottom watering, fungus gnats don't stand a chance. They're also good for cacti and succulents that don't like to sit on top of wet soil for too long. I find them versatile because they can be used as a medium too, for example for succulents. A bonus is that they look real cute and you don't tend to see the mineral deposits from water (water where I live is rich in minerals).

Hope this helps!