To get a comprehensive overview of your system's resource usage, install and run the btop command. It's a top-like interactive system monitor that displays a range of system information, including:
CPU usage (per core and overall)
RAM usage (free, used, and cached)
Disk usage (per disk and overall)
Network usage (bytes sent and received)
Process list (with CPU, RAM, and disk usage per process)
System temperature
Uptime
@Sinfaen I really want to, but the UI is just not that good, and I do really care about how the application looks.