This is the headline of an online article
How to Prepare a Quote for a Job
The closest meaning I've found in dictionaries is an estimate, but what does a job estimate mean? Is it all about telling the employer my rate?
If someone asks you to do a job, for example, they ask you to make a website, they will ask you how much you will charge before you begin work.
They will ask you to give them a "quote" or an "estimate". The difference is that an "estimate" may be changed later, if there are unexpected problems. A quote should be a fixed price (in practice this distinction may not be strictly observed).
A client will probably get several quotes and choose the cheapest that fulfils their requirements. If a client asks for a quote you should tell them how much you would charge to do the job.
This only applies to contract work, not salaries or wage-work.