What worked?
I mainly used the instructions in this article: https://techorfy.com/root-samsung-galaxy-tab-s6-lite/
Main take-aways:
1. The tablet/phone bootloader must be unlocked (In the developer options OEM解锁)
2. Used Magisk app to patch the boot.img file and replace the one in the factory stock AP*** file. Used Odin to refresh the files to the tablet. TWRP was not needed and used.
3. Some useful tips: To enter the tablet download mode: press volume UP + volume DOWN buttons, then plugin the power cable.
