How to Handle Optimization Problems?

In order to define an optimization problem, you need three things: variables, constraints and an objective. The variables can take different values, the solver will try to find the best values for the variables. Constraints are things that are not allowed or boundaries, by setting these correctly you are sure that you will find a solution you can actually use in real life. The objective is the goal you have in the optimization problem, this is what you want to maximize or minimize. If it's not completely clear by now, here is a more thorough introduction.