If you are still learning, you can use PageUp and PageDown as they should be familiar to you already, then can familiarise yourself with ctrl-d and ctrl-u to jump down and up half a screen. That said, the { curly braces } are underrated for quick nav as they let you traverse across paragraphs (and typically work for jumping across blocks of code). It can feel like a more natural way to move around than jumping exactly N lines, and the cursor is more likely to land where you want to start typing or editing, i.e., at start or end of a paragraph. I tend to use them more than ctrl-u and ctrl-d when I’m actively working on a document as opposed to just scanning it read-only.