Mix Hacks
You have many different types of hacks you can perform in Watch Dogs 2, and they’re each pretty good on their own. However, you can get creative and really take advantage of the skills afforded to you to make your life much easier (and the lives of your enemies much more challenging). This is done by mixing multiple hacks into one big trap or attack.
One solid example is turning a car into a moving EMP. You can throw an Electro Shock Device onto a car, then hack the device to trigger when an enemy is within its blast radius. Then, you can hack the car to drive it to where a group of enemies are congregating. Once it gets close enough it will shock everything in the vicinity, leaving you a free path to walk through as everyone sleeps.
There are many other creative ways you can mix hacks, so let your imagination run wild and think outside of the box.