Wavetable is almost like cheating, hahah, the presets are so good, and being able to drag and drop in your own wavetable envelope is crazy fun. Still, there are some basic ideas in flac's vidoes that showcase widely agreed upon models of thinking about how sound synthesis works. If you can understand the differences in sound between the four waveforms of this shirt on top of the idea of the envelope (attack, sustain, decay, /however people want to dissect it) then you're doin' OK. You should check out YouTube tutorials like e.g. how to make a tuned snare from Ableton's Operator stock plug-in. Before YouTube tutorials grew on trees, I stumbled through sound design. Although the experience yielded some unique results (and plenty more dead ends), we're now living in a golden age of YouTube expositions. I love it. Cheers, yo.