how i can Improve Myself In solid work's simulation ??
First make sure you understand FEA fundamentals Read "Building Better Products with Finite Element Analysis" by Adams & Askenazi
There is a big difference in knowing how to use a software package and knowing how to approach design problems in FEA including the limitations and pitfalls of various approaches.
Create and solve benchmark problems with known answers. Make sure you get the right answers and know what went wrong when you don't.
Online youtube tutorials often show the operation details of a software package. Be wary as some don't represent good FEA practice and other are just plain wrong.
Many relevant real world problems involve non-linear analysis.
Once you are familiar with the basics of linear analysis a good read is Nonlinear Continuum Mechanics for Finite Element Analysis
Consider a graduate course in FEA
Practice and educate yourself outside of Solidworks