The "Make it Easy" principle is to reduce the friction associated with starting a new habit, making it as easy as possible to take action. The easier a habit is to initiate, the more likely you are to do it consistently, allowing it to become ingrained.
For example, if you want to start jogging every morning, you could make it easy by laying out your running clothes and shoes the night before. This eliminates the need to search for them in the morning, reducing a barrier to getting started.
Or if you want to eat more salads, pre-chop all your veggies and store them in the fridge. When it's mealtime, it's much easier to assemble a salad, making you more likely to opt for this healthier choice.
By making the habit easy to start, you increase the odds of consistency, which is key to making any habit stick.