Edit: The pre-launch checklists included are mostly as examples, a general explanation from maybe once a rocket is on the pad would be great.
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What are the main steps in the lead-up to a rocket launch?
I know that rocket launches are extremely complex. From watching a few, I get the sense that there are some things that happen in a standard way in all rocket launches, maybe depending on propellants, booster combinations, and payloads they are more variable than I think. I feel like if I understood what those steps are about, at least a little, it would give me a sense of how the rocket works.
For instance, loading of propellants happens at a certain time, why then? I can only find two run-downs of pre-launch sequences, one for Falcon and one for the Space Shuttle. Falcon:
These imply a raft of questions but it's a bit overwhelming. Isn't there a general scheme to things to make it easier to grapple with? An overview, and from there more specific questions can be asked? For an uncrewed launch vehicle, what is the basic outline of the things that need to be done before launch, and the basic reasons?