Lottie is an iOS, Android, and React Native library that lets you easily add high quality, small file size animations to any app. Be sure to also check out the free LottieFiles.com resource for tons of animations to download.

First Run UX is catalog of first run user experiences in mobile apps and other products curated by Krystal Higgins. Great resource for inspiration and best practices to make sure new users to your app hit the ground running.