Check infromation of CPU, memory and Hard Drive information

[CONTEXT]
In order to check the information of your CPU, memory and Disk usage.
[HOW]
To check your CPU information, just execute

$ cat /proc/cpuinfo
or
$ lscpu

To check your Memory information, just execute

$ cat /proc/meminfo

To check your Disk Usage information, just execute

$ df -h


[SOURCE]

man proc
man df