I wannna go back to CAD design, where and what do I need to start again ?
Without meaning to appear facetious, I am inclined to start by asking "where are you coming from?" Depending on the background you come from (eg. experience, industry, interest, specialty, etc) the options would vary somewhat, I am guessing...
I suggest you can start from watch some Youtube video, just use SOLIDWORKS as the keyword when you search in YouTube.
The previously mentioned ideas are great.
If you are interested in only doing 2D CAD (like early AutoCAD) you can download a free ACAD workalike called Draftsight from the SW website.
If you are thinking of SW instead of other 3D Software, try to contact a SW VAR (Value added reseller) in your area to see if they can get you a short-term trial package. If you are a currently-enrolled student you would be able to purchase a student edition at low cost. If you are US veteran with suitable discharge papers, the student package is even cheaper.
Also, consider seeing if there is a SW User Group in your area. This is a good source of learning and networking.
Don't. Not until you learn how to describe problems better. You are useless as a designer until you learn this.
You don't want this as your future.
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