I have a world idea (and definitely [not the only one with such an idea](https://www.reddit.com/r/worldbuilding/comments/58zy4s/i_want_my_world_to_be_set_on_an_earthsized_moon/) in which the main location is a moon of a gas giant, that has life like on Earth.

What are the effects of the presence of the gas giant in "global" scale?