Years ago, we wrote an article, web development life cycle , (which is still relevant in 2021) which explains how a web development business flow might work between the client and a web developer. The process is simple and straight forward. I decided to create a simple flow diagram for better understanding, and here is that process flow diagram. The diagram widely covers the process in terms of business perspective, starts from a call/email inquiry from a potential customer till the final project delivery.
Leave your feedback if your process deviates or if you have better flow or even a piece of improvement which might help the users.
Some of you might have a different approach, and I look forward to hearing from you.