Mix the hot water in with the chia seeds and let it rest for 10-15 minutees. Using hot water causes the chia seeds to absorb the water and swell much faster than tap water--which means your pudding will be done sooner and you can eat sooner! It is very important to not rush this step. Allow the chia seeds to absorb all the water before adding the other ingredients.
I mean, that's really the only thing you need to know. Other than that, mix everything together, and let it chill in the refrigerator while you chill with some snacks or dinner.
The chia will make it gel and set into a pudding, and coconut milk will make it creamy, and the cinnamon and almond milk will make it delicious.