Well, such a rookie question but I am looking for some new ideas to explain about bitcoin and why they should have bitcoin in the simplest way possible, because 90% of them will not be interested in learning the whitepaper if they don't get the concept of decentralization and how central banks are ripping the people with money printers.
So no need to talk about price and share any technical source, just plain and simple, how would you explain Bitcoin to someone briefly?
This thread is a month old, and I only just saw it (or saw it but didn't grasp the depth of the topic). The OP is tackling a very complex issue: how to explain something complex simply. This requires certain skills, as not everyone can explain bitcoin simply and clearly to a newbie. Unfortunately, I don't have this talent, and I probably wouldn't bother telling you that bitcoin can't be owned in the traditional sense, and that coins don't actually move between wallets; only ownership information is transferred.

I'd start by saying that bitcoin is electronic digital money (the description is taken from the WP), information about which is stored in a distributed (decentralized) public ledger (blockchain), which can be used to buy and sell goods and services without a centralized manager (regulator). Complex? And I warned you about lack of talent.

Of course, this cannot be explained simply, and in any case, newcomers will have to be educated for a long time (depending on their level of technical literacy).