if you want to know, which folders/directories on your hard drive take up the most space, i highly recommend
sudo pacman -S ncdu
you can start it in your terminal with "ncdu". by default, it shows all directories and files in your home folder. start it with "ncdu /" to look at your root directory.
if you want detailed information about your cpu, use
cat /proc/cpuinfo
if you want detailed information about your ram, use
cat /proc/meminfo