Got offered to do SEO to help with a YouTubers app- What are useful SEO methods for apps?

Simply put when it comes to websites I have strategies down fairly straightforward. Get high quality links, keep the website good quality, etc…

But what about apps for both Google and IOS apps. Let's just say for example your app keyword was 'vegan cooking recipes', what could you do as an SEO yo help the app?

Does getting links to a landing page linking to the app help? Do links to the actual app help with rankings?

Would appreciate any ideas for a strategy to rank an app, and they…

Got offered to do SEO to help with a YouTubers app- What are useful SEO methods for apps?