Everyone on producer forums is looking for the hottest new off-by-a-penny plugin to solve all their issues when you can get 99.9999% there just by making sure waves aren't slamming into each other.
Minding panning, amplitude, and phases will get you most of the way.
Phasing explained with a sine wave: a sine wave works kind of like the wheels on an old steam engine. The engine (oscillator) keeps going in a circle, moving the wave (the thing that connects to the wheels) up and down in time.
Polarity is where it _starts_. So if you start two engines at the same time moving in opposite directions, they cancel out. Going in the same direction, they're additive: you get a louder signal. https://www.youtube.com/watch?v=I4V0b-RLknc
You can imagine this gets more and more complicated to reason about as your waves get fancier. That's why inverting polarity is good, like an artist does on a painting they've been working at to see the flaws.
Try this on your favorite synth. Helm is free and cross-platform. Start up both oscillators with the same kind of wave and invert one. It'll go silent.