SAP is just like an ocean and every droplet is like one SAP Transaction Code. How to find the relevant SAP Transaction Code for a process without knowing anything.
Go To Transaction Code SE16T and execute for Find Transaction Code option as highlighted below
After Executing we get below screen.
Now suppose I want to know transaction code for Internal Order so I type Internal order.
Above we got all the transaction code for Internal order.
For video link please check below