If you want an abs routine that covers all the key areas, then you can follow this workout from Jeff Cavaliere which can provide everything you need to build those six pack abs.
In the video he takes you through all the movements involved and gives you both beginner and advanced versions of each exercise. If you are a beginner you can of course move onto the advanced versions as you become stronger.
He calls this the only abs workout you will ever need although he explains that in reality you can explore many different types of exercises for variety and reaching your full potential.
Go ahead and watch the video and try these abs exercises yourself.