I am building a personal website using WordPress and need to implement the following features. However, I am not sure about the best approach for each of them:

Multi-language support:

I want users to switch between multiple languages (e.g., English, Chinese). Are there any performance concerns or SEO issues I should consider? User input & formula calculation:

I need a feature where users enter some data, and the website calculates and returns a result based on a predefined formula. What is the best way to implement this in WordPress? SEO optimization:

I want every page to be optimized for Google SEO. What are the best practices for meta tags, schema markup, and performance optimization in WordPress? Rolling logo graph:

I need a scrolling animation that displays multiple logos continuously. I would appreciate any guidance or recommended solutions for implementing these features efficiently in WordPress. Thank you!