This guide explains how to use Smart Lock on the Galaxy S8. Letting your phone unlock automatically in trusted places or trusted devices.

The bootloader, in almost any computing environment (not just Android), is executable code that runs before the operating system loads and starts to run.

To install TWRP, however, you do need an unlocked bootloader first, which is why this particular unofficial version of TWRP for the Galaxy S8 Snapdragon models is rather significant.