That's more or less how it works. Essentially when you post or comment from PeakD, Ecency, Hive.blog or any other front-end you're not posting to those websites per se, you're using them to post to a blockchain. You can look at a post from any or all of them because they all derive the information from that one place: the Hive blockchain.

They're user interfaces, shells or skins, so to speak. That's why I keep calling them front-ends. The back end is the blockchain

That's the general gist of how it works

The error you received was probably because you run out of Resource Credits. RCs are an abuse-prevention measure to protect the chain from being spammed into oblivion by bots

Each time you post, comment, upvote, follow someone or do anything else here (transact with the blockchain) it uses a small amount of your Resource Credits. You start with 100% when you create your account

It's like your HP in an RPG. Or maybe MP is more apt. Each time you cast one of these "spells," your MP is depleted. Different spells use different amounts

Resource Credits recharge at a rate of about 20% per day on their own

Have a look here to see yours: https://hiveblocks.com/@lv99-rd-chocobo

(Hiveblocks is another tool built to extract and display information from the Hive Blockchain on a webpage)

I'll delegate some HP to you to get you back up and going again. Hang on a moment...