Is it okay if i leave my macbook pro open everyday? and it is plugged/charged always?

I offer the dissenting opinion, applicable in certain situations.

If you have a cat, it s a bad idea. Cats like to sleep on warm keyboards and, worse, often see the computer is a depository for biological samples. We have a kitty---my MBP stays closed when not in use.

Also, any liquid spill can ring the death knell for a MacBook Pro. The display lid has a gasket that can help keep liquid off the keyboard area, but only if the lid is closed.

That's fine. Every once in a while you should unplug it and let the battery get down to ~50% so it can get some "exercise."

No, it isn't bad. You do need to do a charge cycle once a month to exercise your battery.

Do you have your computer set for sleep?