I watch a lot of YouTubers (Andrei Jikh, Stansberry Research, Anthony Pompliano) - there's a lot of videos explaining the basics. There's also a good thread on HousePriceCrash where people post the latest updates/tweets, though it does seem to be a lot of misogynistic blokes so I only check that once in a while.
The "it has no intrinsic worth" argument can be used for just about anything - paper money only has value because governments say it does, gold only has value because we've decided it's a store of value. Bitcoin is currently seen more as digital gold, a store of value, rather than a viable currency (though IDK, that could change). The selling point is that there's only a limited amount that can be mined, and it's decentralised, so no-one "owns" it. Every 4 years the mining reward halves, and around those times the price jumps up too.
Governments have tried banning it, but they can't, because people will buy it anyway - how can you ban something online? Loads of governments have started mining it instead, and in most countries it's taxed as an asset. In the UK it comes under CGT.
Part of the reason it has so much value is because it's so expensive to mine - if it was free to mine, anyone could do it, and it therefore wouldn't have value. Supply/demand.
The reason it's shot up recently is because of inflation fears with covid money printing (furlough, helicopter money e.t.c.), and because big companies like Tesla, Square and Microstrategy publicly announcing they've invested millions in it. Payment companies like Paypal have also started allowing people to buy/sell it, so it's gained a lot of mainstream press.
Personally I've put in some really piddly amounts (£10 3 years ago and £100 in Feb) and am kicking myself, as it's gone up loads since, wish I'd stuck the whole house deposit on it!