since I used the system of having a filing cabinet with folders full of papers for years before I got a computer,, I still think of the computer having the same system. So i think of it like this,, if I turn the computer on it's like going to the filing cabinet and getting an arm load of folders to work with,, everything i will need to work and I bring it to my desktop, ready to open and go to work. someone calls me to ask me about some contract from 5 yrs ago,, I go to that folder and open it,, get the info ,, etc. At the end of the day,, I have two choices,, either put all the folders back in the filing cabinet all in order so that I can find them tomorrow,, or just let things stay scattered all over the desktop, floor, etc. so when I go back to work I have to look for files for half the day before getting started again,, and take the chance that something gets mixed in with the wrong folder, etc.
You can shut down by pulling the plug,, but after time things won't get back where they belong,, and the computer will slow,, eventually the operating system will crash and you can start all over,, but many of your files will be lost forever.. but it's up to you.