How does WordPress paintings (underneath the hood)?

Do any of you may have a useful resource that explains how WordPress works underneath the hood? I perceive what the recordsdata do. I do not perceive when they are processed.

Websites have 10s of 1000’s of recordsdata. WP cannot learn all of them each time a URL is asked, can it? Are all of them learn upfront and stored in RAM? If they are learn upfront, what triggers that?

Has somebody noticed a common assessment of the order of operations? Which teams of recordsdata get loaded when.

I have been content material with construction issues and plugins. However I want to do a little optimization and I spotted that I in truth do not understand how WordPress works.

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