can't understand derviatives from searching all over the internet I have tried to follow a lot of tutorials out there for explaining derviatives and show (understandable)examples but i couldn't understand any. Can anyone link me a useful and easy to follow tutorial or explain derviatives  for me?

https://www.youtube.com/watch?v=N2PpRnFqnqY
Khan Academy is a great resource if you want to learn math online. It also has a wide selection of calculus tutorials that are all narrated and explained very well.
I will try to explain what a derivative is in a nutshell: it is the slope of a line at a point. For example, the derivative of the function $f(x) = x^2$ is $f'(x) = 2x$. (the apostrophe, or 'prime' is just convention for derivatives.) You will notice that for $x = 1$, the slope of the tangent line is $2x$ or $2(1)$. (You will also have to change the y intercept). Observe the image:
parabola image
