What is Tax Loss Harvesting in crypto?

So, I'm completely lost here.

My accountant just sent me a rather panic-inducing email about offsetting my capital gains from that freak meme-coin rally back in March. She asked about my defensive tax strategy, prompting me to frantically type into my search bar: What is Tax Loss Harvesting in crypto?

I mean, I'm just a regular guy trying not to get completely wrecked by the IRS. Last year, I bought a painfully heavy bag of Solana NFTs right at the absolute top—terrible timing, obviously—and I'm currently sitting on a gut-wrenching 60% deficit. Ouch.

But I also sold some Ethereum for a decent chunk of profit earlier this spring.

Can these two isolated events magically cancel each other out? That's my main dilemma right now. I've read a few fragmented Twitter threads claiming you can dump your losing digital assets to effortlessly erase your tax liabilities, but nobody actually explains the grinding, mechanical reality of doing it.

My Specific Confusion: What is Tax Loss Harvesting in crypto?

• Do I actually have to sell my underwater tokens for nasty fiat, or can I just quietly swap them into a stablecoin (like USDC) to trigger the taxable event?
• What happens if I instantly buy the exact same altcoin back—is there some pesky wash-sale rule aggressively applying to digital assets right now?

I need answers.

Seriously.

Because every single time I attempt to sit down and wrap my head around the precise mechanics of What is Tax Loss Harvesting in crypto?, my brain just shuts down entirely from the sheer regulatory ambiguity of it all.

Maybe a quick table helps illustrate my miserable spreadsheet situation right now:

If I sell those bleeding alts today, do I instantly owe practically nothing on the ETH gains? Can someone finally explain What is Tax Loss Harvesting in crypto? in plain English?

Any actionable advice—especially regarding automated tracking software that doesn't cost an absolute fortune—would save my sanity right about now. Thanks!