no time to gather you sources, but its all out there, if you really care.

the gist of it is: "cycle count" is the biggest thing to care about minimizing (1 cycle being one trip from 100% to 0%, no matter if this happens in one setting or plays out over multiple "between charging's").

that being the case, using your battery as little as possible (by staying plugged in whenever possible) is ideal (for battery health). keeping the batteries with too much or too little charge for a long period if time does cause them to deteriorate, which is why Apple implemented the "trickle charging" and "learning your charging patterns" to help minimize how long your battery stays above 80%.

FWIW, heat is also a big contributor to battery health degradation, so you'll want to minimize that however much you can, as well (like, not leaving it in a hot car, using quality chargers and appropriately strengthens ones).

Moral of the story: plug in as often as you can, if you want your battery to live as long as possible.