I also understand some knowledge about the blockchain and bitcoin. But there are still some questions, bitcoin system is how to run it?
Take your time to learn, this forum is the first step if you want to know bitcoin. Read a lot and try it for yourself. As soon as you start to deal with bitcoin addresses, wallets, etc. you'll start to understand the basics... As soon as you start to wait for a transaction, because it's not confirming for days, you'll start to understand the needs for further developments for the system and as soon as you won't care about price drops (like nowdays we have), you'll be fine with bitcoin.
Based on the article I happen to read, a transaction is transfer to a value between bitcoin wallets that gets included on the blockchain. Bitcoin wallets hold a hidden piece of data called a private key or seed, which is used to sign transactions, providing a mathematical validation that they have come from the owner of the wallet.