(If you find this section a struggle then don't worry. It is not as essential task and you might be better to spend time on other sections.)
One simple way to ask a question is just to change the way you say a sentence, by making your voice rise at the end, or, when writing, by adding a question mark.
This way does not work very well if you have a question word like quand (when), où (where), pourquoi (why), qui (who) or que (what).
Another method is inversion. That is, changing the order of the subject and the object: this is more difficult, but there are patterns you can learn to help you.
When you use inversion, you must put a hyphen between verb and subject.
NB: neither of these methods of forming questions works very well when you have a question word: if you start off with a word like quand or où, use est-ce que next.