Needed Action Hooks

Hi, I want to know if I can get the following from your plugin by means of using action hooks:

1 – I would like to receive the user_id assigned to a user by WP after they register from a form created by your plugin. Can you please let me know if there’s a hook for this?

2 – I would like to know if there’s a hook to detect when the user is about to edit their profile, I want to grab the data they have before the edit goes through.

3 – I would like to know if there’s a hook to detect when a user has updated their profile, I want to grab the new data they updated.

Any help would be appreciated