I'm planning on learning Godot Engine but right now I really have no clue where to start.
Find some demos, mess around with them until you get a hang of some basics. Take notes on how and why stuff works. Memorize some useful keyboard shortcuts.
If I remember correctly, Godot has its own scripting language so you'll have to learn that too.
Once you're somewhat familiar with it, try making something simple like a mini platformer.