Here's a Tweet by the author describing this series of posts:
My bitcoin UTXO article trilogy is complete!
The 1st article is an introduction to what a UTXO is, and why they matter.
The 2nd focuses on transaction fees, and why holding a lot of UTXOs can get expensive.
The 3rd goes through important privacy considerations.
Links below!👇

See also the posts, found here on SN, for the other two articles from this trilogy:
The second article:
More UTXOs, more problems: High fees, signing failures, and how to avoid them #80667 https://unchained.com/blog/too-many-bitcoin-utxos
The third article:
UTXOs, addresses, and CoinJoins: Preserving privacy in a bitcoin economy #76971 https://unchained.com/blog/bitcoin-utxo-privacy