Next.js 16.3 went stable on 3 August 2026. Instant Navigations make a server-rendered site feel like an SPA. AGENTS.md, bundled docs, and skills stop coding agents inventing APIs from 2024. What I would actually do on an existing Next.js site this month.
A Mini App is a web product that runs inside Telegram - not a bot, not a native app. How it is wired, how initData auth actually works, the UX constraints that kill a pasted website, and when I would ship one instead of a site.
A practical map of database types for web products: relational, document, key-value, graph, time-series, vector - and the 2026 default I ship unless the data model forces something else.
Launch is not the end of the work. Without someone who updates prices, watches SSL and backups, and fixes the form - the asset dies quietly. What website administration actually is, and how I run it as a developer, not as a person who only clicks in WordPress.