Form 6 is the easiest fighting style to learn but the hardest to master; a jack of all trades fighting style. But it is a blank slate and it's the your job to insert your identity in the fighting form where you can incorporate other lightsaber forms or even foreign fighting styles to it. Jedi Master Cin Drallig said it took a decade of continuous study to become a true master Form 6. This is why it is the preferred Lightsaber Form for strategists such as Exar Kun and Darth Revan who quickly adapted to the flow of battles or those with an exotic way of fighting such as General Grevious and Starkiller.
so this is what KZbin recommends me when I watch SW clips and Hololive EN clips(from Japanese clippers) these days... A 100% Japanese Star Wars explanation video