A stuck tx is just a low-priority tx. Nothing more.
Check it out at 

BitVault Blog
Stuck transaction? How to fix it -
By mordom

Once you internalize the UTXO model, Bitcoin stops looking like a bank account system and starts looking like a distributed ledger of spendable outputs.
👉️ 

Your mnemonic isn’t “a backup.” It’s a deterministic key generator encoded as words.
Entropy → seed → derivation path → address.
If you don’t understand that chain, you don’t understand custody.
Full breakdown: 