There are different ways to display error/validation message or user message.
1. ValidationError
This is the simplest for to display Exception or Validation Error.
from odoo import exceptions
raise exceptions.ValidationError('Please Save Quotation')
2. Message Alert
This is less intrusive way to give Reminder or Alert Message.
message = 'Click Save to refresh the Cost & Profit!'
warning_mess = {'title': ('Refresh'), 'message': message}
return {'warning': warning_mess}
3. Alert Pop Up
Similar to Message Alert. You can find the sample in the account module that using a field to control it.
<div groups="account.group_account_invoice" class="alert alert-info" role="alert" style="margin-bottom:0px;" attrs="{'invisible': [('has_outstanding','=',False)]}">
You have <bold><a class="alert-link" href="#outstanding" role="button">outstanding debits</a></bold> for this supplier. You can allocate them to mark this bill as paid.
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