I always just close the lid, because it’s quicker to resume work the next day and macOS works fine without being rebooted for months. If I’m flying with it or know that I won’t be using it for more than two days, I will turn it off
But you do you, either way is fine and healthy for your machine
But my cousin told me to always turn off when done using as theirs won’t turn on anymore as they always just put it on sleep mode
That’s very weird. Windows laptops have a habit of draining their battery, Macs don’t. Something about “motherboard related” sounds like BS, to be honest