There may be courses for this. But if you want honest opinion, it is waste of money.

Why? Because every laptop is different. Even if the model has same model number. There might be revisions later that changes screw points and hardware layout.

You could learn how to disassemble a laptop on youtube. Serious. I do this all the time.

The original way was to search for factory service manuals. But this is time consuming and usually not available for very new models.

Your questions seems to veer into laptop customization rather than repairs.

Want to change colors? Just get it wrapped.

Some repairs are really pain in the butt. Laptops made just 10 years ago has since changed from bracket mounted keyboard to plastic rivet style to save costs. You have to cut out those rivets and then glue back the rivet points to mount the keyboard. Else the keyboard flops and will not press nicely. This is easily an hours job to do properly.

OIC. For plastic scratches, with simulated finish like brushed aluminium, there is no way to fix it. So just find a vinyl wrap with closest color and wrap over it.

For aluminium panels, there is also no way to refinish it. Aluminium once dented cannot be knocked back to shape. It can only be replaced.