Time dilation is usually explained in a simple way using a "light clock" (1, 2). Here I started a discussion about gravitational time dilation, offering a simple explanation I found on internet, but in that place is off-topic and, anyway, I want to extend this discussion, including time dilation in SR. This one was explained in a simple fashion (see here) and rewarded, although the explanation is not only naive but also incomplete. So, I want to discuss this further. First, I want to "hear" how the light clock explanation for gravitational time dilation (see link above) works for up and down movement of the light. Second, I want to "hear" how the longer time needed for the light to complete the cycle, seen in light clock explanations, explains time dilation in general. In Ryan’s video (the one rewarded) there is a beginning of an explanation ... What do you think about it?
Please keep in mind, first, that I totally agree with relativity's results/predictions and second, that I don't expect from you the mathematical models and equations used to make the predictions, I want simple answers to the questions above, the physical explanation of time dilation.