How to get info regarding hardware details

Lots of people ask

Is there a way to detect the number of RAM slots available on my laptop, and the number that are presently occupied, without opening the laptop?

Use CPU-Z. It will give you the CPU, memory details etc, how many RAM slots are left, how much RAM is installed in each slot.

Or you may install SIW. Download the free version, it is good enough. I prefer SIW to CPU-Z. SIW even provides the info on the maximum RAM supported by the motherboard/chipset.