@GreenSock Thank you for your guide it was very helpful!
What I actually looking for is something combination of This codepen and This one. What I mean is that I want to have some titles on left and changing content with scroll on right. I handled the content and scroll but I need the right content to be single scroll(just change one section with every scroll).
I found the first codepen I linked helpful but it has some problems. first that if you use the scrollbar to scroll it's very messy! And the second problem is that it isn't handling the single scroll that I want.
Can you help me with these problems?