SpaceX have released a free Crew Dragon docking simulator which runs within your browser. Simply click the link, read the instructions, and try your hand at it. It’s also fun just to fly around the 3D model of the International Space Station. The simulator is a clone of the user interface used in the actual spacecraft, and the physics of the thrusters and spacecraft are simulated. If you’d like some tips to get started and an example of docking, here is a Scott Manley video showing how it’s done.