Actually, you can go faster than the speed of light. You just have to START faster than the speed of light. You can not travel AT the speed of light, therefore you can not accelerate past it.
The easiest way to describe it is with math. Scroll down to the Lorentz Equation
https://en.wikipedia.org/wiki/Special_relativity
In the special circumstance where v (your velocity) = c (the speed of light) then you end up dividing by zero, and that’s not a thing in our universe. So it can’t happen.
What this also means is that as you accelerate towards the speed of light, your relative mass goes up and the energy required to go faster also goes up. As you hit the speed of light, your mass becomes infinite and the energy required to get there also becomes infinite.
The Large Hadron Collider (LHC) at CERN does this. It takes a beam of protons and accelerates it to ALMOST the speed of light using a huge cyclotron. The relative energy gets pumped up and then the proton beams are allowed to collide to create huge energies.
If you have more than a passing interest, I HIGHLY recommend the book The Elegant Universe by Brian Greene. The first part of the book has the best explanation of Relativity I’ve ever read. The last part of the book gets lost in String Theory, but it’s worth it just for the first part.