Sysinfo : This command is used to display system information i.e cpu, memory, etc
Memory and Swap : These command give information regard physical memory and swap area
Disks, Filesystems and Devices: These commands display disk information, file system etc.
Networking : These commands are used to display and configuring network parameters
Crash Dump : To configure display and use crash dump data
Performance Monitoring and Diagnostics : The commands List, Monitor and trace processes
You can download the entire Cheat Sheet from the link
You can download the entire Cheat Sheet from the link