Device Information

Disk Usage

# Space occupied by file
du -hc ./Download/*
 
# File System Usage
df -hT

Flags
-s: Summarize
-a: All files (Not just directories)
-h: Human Readable
-c: Total Size
-T: Show File System Type

CPU & Memory Usage

# Memory Usage
free -h
 
# Returns CPU information
lscpu

Disk Information

# -t: Detailed Information
sudo lsblk -f
sudo lsblk -t