

Start from the field you want to show and ask under which conditions it should be visible. Give each field one rule with all of its conditions, combined with "Or".
Yes. Link options in a Lookup field or Checkbox fields to Email fields with rules, and select those Email fields as dynamic recipients. The email is sent only to the addresses that match the user's choices.
Yes. With the Gets value action, a field gets a fixed value or a dynamic value through a placeholder, for example details from an item selected in a Search field.
Yes. Add multiple conditions and select "And" or "Or". The action then follows as soon as one of the conditions is true.
No. You create rules in the Rules tab of the Form Editor by choosing a field, a condition and an action from a list. No code is needed.
Rules are the conditional logic of your form. They show, hide or fill in fields based on the answers the user gives, so every user only sees the fields that are relevant to their situation.