Sure you can learn a lot but I have no idea why you would choose Turbo C in 2020 over say a Raspberry Pi with GCC. Turbo C (discontinued in 1990) is going to expose a bunch of irrelevant things today, as even most microcontrollers are 32-bit:
painful 16-bit near/far memory model
a single task operating system (DOS) that has been long obsolete
painful 16-bit near/far memory model
a single task operating system (DOS) that has been long obsolete
no support for networking or threads
I could go on and on.