What are the sites from where I could learn solidworks simulation part or other CAD softwares after learning Autocad and Solidworks
A lot of people use SolidProfessor.
Try to find a project that is close to your heart and do it until the end. To do this you will need to learn the features one by one. Solidworks answers the majority of practical questions in exercises directly inside the software. And Youtube is a gold mine.