How to convert a minimization problem to maximization problem and vice versa

Question

So i have this LP problem

that can be transformed into

Now thanks to previous users I know that to transform min to max all i need to to is multiply the objective function by -1

But say i want to transform a maximization function to a minimization function?

1) is there any use in doing so ?

2) if there is any use, what would the relationship be?

Please explain in the simplest way possible; i am new to this topic. Thanks!