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Deep discharges and sitting at low state of charge for a long time are the main things that shorten battery life.

Also harmful is charging to the absolute maximum state of charge. I believe most vehicles have a setting to terminate the charge at a level that maximizes battery life and another setting that maximizes range.

I'm not a battery expert, but I think the full charges do more damage than charging to 80% capacity or so. But I don't know if there's any difference to battery life with multiple short charges vs one long charge up to 80%.

i have a tesla model 3 and i believe that multiple smaller sessions are better for the longevity of the battery. elon has said that 'a plugged in tesla is a happy tesla.'

you're also only supposed to charge to 80 or 90 percent charge unless youre going on a road trip, since charging to the absloute max (and conversely, discharging to near zero) is worse for the battery.