Unity Player Control: ( Better 2D platformer game control )

i would like to add 3 features in my 2D platformer game all the three features are included in the video Url , except for the first one and last one. and the features names that i want to include in my (player control script) are: 1-Jump Coyote Time / Hangetime. 2-Jump Buffer. 3-Look Ahead. vido Url: [login to view URL] i struggle at implementing it, so i would like someone to do it for me . make sure you can apply these feature with the (Attached) player control script.