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I work as an iOS developer at my day job, but have become concerned that my general CS skills / maths are getting worse due to the lack of day to day applications. I mostly work on UI and networking.

Are there any good books, problem sets, or fundamental habits that I could use?

For context I'm a day to day iOS developer. However I'd like to quickly be able to make cross platform applications, and React Native is apparently lacking for Android.

I've submitted a HN iOS application that got rejected as posts can link to media outlets such as NYTimes, Reuters etc. After looking into this a bit more, it seems as though newspapers and the media dislike linking to their websites without explicit agreements?