I'm bored, what can I do on the PC?

I would like to do something on the PC, but I do not know what. I do not have a good graphics card, the only thing running is Minecraft. Unfortunately, I currently have no money and play only demo. I'm 14

I would also like to do something to Microsoft Word, unfortunately, do not know what

In Word? Write a book.

If you want to do something with Word, just write something. Poems, stories, what-if scenarios, dadaist nonsense, lyrics, diary etc.etc.

I even wrote a book idea. So a summary. I had completely forgotten that.

Write a book or a manual or (useful for the school) summaries of the substance. This repeats again the material and then have in your own words explanations to the topics, so that learning at the end may be easier.

Otherwise, there are also many things you can do. For example, if you want to watch something other than Word, LaTeX would be an option. It takes a bit of learning effort. Also, learning how to write scripts (Powershell on Windows) is always useful.

If you really want to do something in the direction of more complex handicrafts, also training in FreeCAD would be useful.

There's enough to learn. Just think about what interests you and what you want and find out what you need.

What else is still possible: read news. Does not sound all that exciting, but you should at least have a rough look at the current affairs from my point of view and in politics that can also help.