In a bathroom remodeling project, I noticed the newly installed plywood sub-floor is flat but not level, which may cause issues when installing the shower and the sink cabinet (water evacuation and shower door and cabinet not properly aligned with the walls).
Now, Internet tells me I should level my floor with self-leveling compound (after having caulked plywood joints and applied a coat of primer). Also, Internet tells me that putting backer-board over that (when settled) will cause it to break when I'll add the screws to fix it to the sub-floor. And Internet also tells me I could self-level the sub-floor and NOT use backer-board.
What is the proper way to level my sub-floor before installing my tiles?