You just have to not mix and match. If you mix them the two need special bonding at every single connector or they can cause arching and fires.
Check it out:
https://lugsdirect.com/WhyAluminumOverCopperFAQ.htm
And you can browse that site for lugs, and they’re mostly rated for aluminum and copper. Copper-only lugs are actually rather unusual.
Sure, you can’t stick copper and aluminum wires into a wire nut, and finding terminations for smaller-gauge aluminum wire can be hard. But for larger wire, it’s really no problem.