How to improve writing code in python?

[Banh]

Hi,
I have a problem with learning Python. My code is really bad and I can't solve many problems. I really want to improve it. Do you know any website which helps me to learn python effectively (for beginners)? This is my first programming language and I am studying about manipulating the images using Python. If you also know any websites relating to manipulate the images, can you guys tell me? Thank you!