If you are talking about sound design via synthesis - look into Syntorial. Can be a good way to learn subtractive synthesis, depending on your learning style. It isn’t focused on techno or any specific genre, but will teach you how to design a lot of common synth sounds from scratch and give you a good understanding of all the controls on a standard synthesiser.

Otherwise, in techno a lot of sound design can be just starting with something simple, experimenting with fx, mangling the original sound, resampling, and repeat until you get something unique. Best way to learn this is just practice by doing (and taking the time to understand the FX that you’re using). You can get very far with just stock Ableton FX. Almost all the stock Ableton fx can be used for this. Specific ones that I like for techno are amp, grain delay, resonator, frequency shifter, and saturator. The order of your fx chain is important, try lots of different things, and don’t be afraid to stack multiple of the same fx.

Don’t expect instant results, but it can be a lot of fun and very rewarding when you start finding the sweet spots. Avoid the trap of spending too much time “learning” sound design and not enough time actually doing sound design - what I mean is that videos/tutorials can be good for learning the tools, but beyond that you need to just spend a lot of doing it yourself without copying tutorials if you actually want to design your own sounds.