A process in ready state is ready to receive interrupts

A process in ready state is ready to be scheduled

It is not maintained in the data structures by kernel, it is only for conceptual understanding of programmers

A process can self-terminate only when it's running

Processes in the ready queue are in the ready state

A process waiting for I/O completion is typically woken up by the particular interrupt handler code

A process that is running is not on the ready queue

A process changes from running to ready state on a timer interrupt or any I/O wait

A process waiting for any condition is woken up by another process only

A process changes from running to ready state on a timer interrupt

A running process may terminate, or go to wait or become ready again

A waiting process starts running after the wait is over

Changing from running state to waiting state results in "giving up the CPU"

Typically, it's represented as a number in the PCB