I've worked with excel macros
But in Solidworks macro i've faced problems with commands specific to solidworks. like Part.SketchManager.InsertSketch etc
I need to learn those commands
I'm not able to get any information about them from 'solidworks help'
please tell me about any possible ways
Try going to Help > API Help, as opposed to the standard Help> Solidworks Help. Assuming that you know VBA, the syntax is located here.