I would like to combine Task 1 and 2 actions into one Auto Action, or should i create separate auto actions? Could i get some help with Task 3 setup?

Task 1
- User types in a number into an CB field with configured as an integer. ie. 1.5

Trigger: onAfterUserUpdate
Type: Email
User: Auto
Access: Everyone
Condition: [field1] Equal to 1.5
Action: Email is sent, say number is correct

Problem: Even if the field is not touched everytime you update the profile, it sends an email because that number is stored in the Field. How can an email only be sent for when that field is edited/updated?
Do you have a list of substitutions that can be added into the email content ie. So i can add the Field value that they entered into the email content, user's name etc?

Task 2
- If 1.5 is added into the CB_field_1 above, then CB should tick a box in another CB_Field_2
I'm not sure on the below code to do that?

Trigger: onAfterUserUpdate
Type: ?
User: Auto
Access: Everyone
Condition: ?

Task 3
- Once a user is added to a Joomla UserGroup "Allowed", it should send an email

Trigger: joomla_onUserAfterSaveGroup ?
Type: Email
User: Auto
Access: Everyone
Condition: ?
Action: When user is added to a "Allowed" then an email is sent to them.

Hi Krileon, thanks for that i will figure out how to do the actions, however could you give me advice on the email part? Every time i create an Email type event and i use the ..UserUpdate pr profileupdate Triggers it sends an email, even if the field is not edited, i basically only want to send the email if the field is edited or updated. Can you give me a heads-up on what the correct trigger is to use etc, so that the user doesn't get repeat emails, that's the only part i'm stuck on?