let me quickly explain how taiko works:
Default keys: ZXCV
Z & V - rim/blue
X & C - inner/red
Although you can change the keys for that at anytime to suit your needs (I use a taikojiro method, D and K being rim, F and J being inner).
There is a circle that is grey near the end of the scrolling area. That is where you hit the notes. Notes will scroll across the area.
Red/Don - Use the inner/red keys.
Blue/Kat - Use the rim/blue keys.
Big Red/Blue - Hit both inner/rim keys at the same time, depending on color.
Yellow/Long note - Hit inner the inner keys to the slider dots. This doesn't increase your life at all, but it does get you a higher score.
Spinner - Repeatedly hit inner & rim over and over in that order. A number will count down each time you do it. Get it to 0 and you beat the spinner.
Claps will be blue/kat, regular notes will be red/don, and finish notes on ANY will be the big red/don & blue/kat.