Guides
The paperwork, explained properly.
Written for people doing the job, not for search engines. If a guide doesn't tell you something you can act on, it shouldn't be here.
Quote or estimate? The difference is legally significant
One is an offer you can be held to and the other is not. Which you have sent depends on what the document says, not what you called it.
What to put on a quote so it holds up
The seven things that stop a quote turning into an argument three months later.