Been shutting off my Macbook Pro for months. Will this cause problems?

Hi,
I only just read today that it's actually best to keep a Macbook Pro on sleep at night and not shut. Is this true? If it is I'll be doing from now on.
Also, I've been shutting my Macbook Pro off at night, every night, even several times during the day if I'm using it during the day. Will this damage it? If so is there anyway to reverse the effects that shutting t down might do?

It makes no real difference whether you shut it down or put it to sleep. Sleep is faster for wakeup than rebooting is. Shutdown saves on electricity or battery power (if not connected to the AC adaptor.)
No harm is caused by shutting down. If you are traveling it's better to shutdown. If not using the computer for a couple of hours then putting it to sleep will let you get back to work quicker.
The computer should be shutdown if it's not going to be used for more than 8-12 hours.

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