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 If you are planning to take this kind of three tiered approach, here would be my recommendations:

Tier 1: SMALL balance for zapping and receiving zaps with a lightning address.
Alby - It is custodial, but has a lot of convenient Nostr integrations and you should be clearing out most sats from it into your Tier 2 wallet every week or two.

Tier 2: Medium balance for occasional spending and building up before transferring to cold storage (savings).
Muun - If you will predominantly be receiving funds into this wallet, then Muun beats Phoenix, since you will usually see the higher fees in Phoenix when they need to increase your liquidity to allow you to receive funds.
Phoenix - If you will be spending and receiving more or less evenly, then Phoenix may be the better option, as  you will usually see the higher fees in Muun when a channel must be opened for you to spend.

Tier 3: Large balance, but highly secure, on-chain wallet with private keys held in a dedicated signing device. Software: Sparrow - This is wallet software you download on your PC to view your balance, your individual UTXOs, to generate receiving addresses (NEVER reuse the same address), and to create transactions when you want to send.
Hardware: ColdCard Mk4 - There are plenty of good signing devices out there, but the ColdCard is my favorite for a number of reasons. Sparrow wallet has a guide on how to set up your wallet with a ColdCard here: https://sparrowwallet.com/docs/coldcard-wallet.html

Only you can really decide what you consider a Small, Medium, and Large balance, but here's my general rule of thumb:

Tier 1: Less than 100k sats
Tier 2: Less than 3m sats
Tier 3: Minimum 1m sat deposits each time. You don't want a bunch of small UTXOs.
*These amounts are likely to change as the price changes this cycle.

It's great to see you progressing in your Bitcoin journey. Please keep asking questions! 
 Most of this went way over my head, but thank you for the information!!

I haven't done ANYTHING on-chain yet, but it is sounding like it is about time to start. I will look into getting a ColdCard and read that guide you linked.