Deo volente is a fancy word that means "God willing". Have you ever heard grown-ups say, "Lord willing, we will do this or that"? Deo volente means the same thing, just in Latin.
Sometimes people plan to do something, but they don't know for sure if they will be able to do it. They might say deo volente to show that they are hoping and praying that everything goes well and that they can do what they plan to do.
For example, "We will have a picnic next Saturday, deo volente" means that the people planning the picnic are hoping they can have it if everything goes well, especially if the weather is good.
So, deo volente is a way of saying that you are hoping and trusting that things will work out according to your plan, but also acknowledging that sometimes things happen that are out of our control and we have to trust in God's plan.