I'm new to Svelte and three.js, where should I start?
For questions regarding Svelte or three.js usage / APIs please visit their official websites:
Svelthree aims to offer an API close to the one of three.js for Svelte-developers, so it seems more logical to start with Svelte. A certain amount of experience with both Svelte and three.js would be best.
☝️ Keep in mind that you don't necessarily need Svelte or svelthree to create highly performant three.js UX, all you REALLY need is knowledge of JavaScript and three.js.