3. Is SPFx framework replaced by Power Apps (Relevant question if you are from SharePoint development background)?

SPFx framework

• No, the SharePoint Framework (SPFx) and Power Apps are two separate technologies that serve different purposes within the Microsoft ecosystem.
• SPFx is a client-side development framework.
• SPFx provides a modern development which allows developers to use web development technologies such as React, Angular and TypeScript to build custom SharePoint solutions.

Power apps

• Power Apps, on the other hand, is a low-code platform for building custom business applications that can connect to a variety of data sources, including SharePoint.
• Power Apps allows users to create and deploy custom apps without requiring extensive coding skills, making
  it easier to create solutions quickly.

Below are the use case which describe when to use what?

Use SPFx when:

• You need custom web parts or deep SharePoint integration.
• You require advanced UI/UX or custom logic.

Use Power Apps when:

• You want to quickly build apps without much coding.
• You’re working with forms, approvals, or data entry apps.