It may be sounds strange but I am finally create a website for my mobile app. Earlier I used my personal webpage in order to share mobile app website. There was just a link to download apps from AppStore/GooglePlay.
I started to participate in startup pitches and website of mobile app become required.
Why am I lived without website for mobile app? Because I am a backend/mobile developer! During 15 years of career in IT as a software developer I am almost didn't touch front-end and UI/UX design. Although have such skills.
It cost me about $120 to create design and landing page for mobile app. I found the developer and designer in one Russian-language community for startupers in Telegram.
Here is the website https://learnazure.app