Rage Against Social Media on Nostr: How does bitcoin improve itself to new problems it faces? (payment fees, halving, ...

How does bitcoin improve itself to new problems it faces? (payment fees, halving, blocks, privacy, etc)
How does a blockchain work without a central management?
Why bitcoin and not any other coins?
What is pow and pos?
Why bitcoin isnt an investment?

i think this is the minimal for a person whom wants to understand how btc works