How can you connect the pieces?

Start with keys if you want to understand authority, transactions if you want to follow a payment, or blocks if you want to understand mining. You can read each lesson on its own; there is no account or required course sequence.

From spending authority to shared historyKeys provide spending authority, transactions spend and create outputs, and blocks place transactions in a shared history.Keys authorise a spendTransactions change outputsBlocks extend history
A reading route from authority to transaction records and chain history.

How would you investigate an unfamiliar fee?

Start with Transactions, then read fees and vbytes. Follow the related link to the mempool explanation when you want to understand waiting. The fee unit and the confirmation process answer different parts of your question.

Where are the site information pages?

Bitcoin Decoded home introduces the publication. Read how your information is handled before using the email learning form.

Which references support this reading map?

Sources: Transaction developer reference; Block chain developer guide.