How Do Hackers Hack Accounts So Easily?

So, I know there are methods like phishing pages, brute-forcing, and such, but how are these top hackers able to hack accounts so easily? It can't just be social engineering, and brute-forcing can it? especially speaking from a stand point of an attack being done outside of a LAN. Even Mark Zuckerberg ended up getting hacked along with other big youtubers!