How to remove ‘Always on Layout’ and ‘Required’ field from the page layout (blue circle and
red asteroid next to this field)?

Standard picklist fields can be either controlling fields or dependent fields.

Custom picklist fields can be either controlling or dependent fields.

Record types can be used to determine

A field marked as ‘Required’ on an object (while creating the field itself on the object by
checking the checkbox for ‘Required – Always require a value in this field in order to save a
record’) can be overridden to make this field ‘Read-Only’ by checking the ‘Read-Only’
checkbox on the page layout.

What is a quote?

What is Salesforce CRM Content?

Which of these can edit a record during an approval process?

Submitters can always recall approval requests.

If the entry criteria for a step in an approval process are not met, then the record gets rejected.