Top processes
Inputting 't' can get top processes information:

By default, the processes are sorted and displayed in CPU utilization. The %CPU and min/max Faults fields are read and calculated from /proc/[pid]/stat, and Size, Res ... are got /proc/[pid]/statm.
There are other modes for top processes. E.g., pressing 1 can switch to "Base" mode:
For detailed information of every process, please refer /proc/[pid]/stat.