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BAS_FUNCTION to show entry and exit from the function - the argument is the just the name supplied, see See the flow of calls and values of variables
BAS_VAR, BAS_VAR2, BAS_VAR3 etc display variables in Name=Value pairs - see inspecting variables
BAS_TRC is like a general print statement to print whatever you want.
BAS_HEX will output a hex dump of the data given, pass in a label, pointer to the data and the length. See hexdumps.
That’s it.
I have found it extremely easy to train development teams to use tracing. It’s very straightforward.