What harm exists in turning a PC on and off every day?

Posted by YoungAmsterdam@reddit | buildapc | View on Reddit | 716 comments

Back in the early 2000s when our family had our first computers, my step-dad told us it's important to not turn the computer on and off multiple times per day because it would damage the computer. Now that I've recently built my own computer, I'm wondering if it's better to leave it on sleep mode all day or if I should be turning it on and off each time. I mean this question to be very general — not specific to my PC parts or anything.

Note that I typically use my home computer in question in the mornings, then I go to work all day, then I come home and use it again and keep it on all night. Is there any problem or benefit or difference of any kind if I turn it on and off twice per day? Will doing this on a daily basis cause any harm to my PC parts?