Top Web/Mobile/Software design strategies

what are your top technologies you turn to when designing a dynamic intricate website.

I am looking to build a program (pretend I was an expert tomorrow). there would be two components; mobile and web platform. essentially field members would collect data (via mobile app) and send it back to headquarters for storage and analysis (web platform).

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Sorry if that sounded trivial and ignorant. I obviously know the basic components i'll need like html, css, javascript, python, and AWS for securestorage.