Copilot is a set of next-generation AI enhancements that revolutionize how you build and launch business websites with Power Pages. Copilot simplifies creating forms, incorporating text, embedding chatbots, and other tasks with a user-friendly, conversational interface that doesn't require years of coding experience. It also offers site users and visitors an enhanced experience, shifting away from traditional click-based navigation and allowing them to uncover information and insights through engaging conversational interactions with your site.
AI-powered features for makers
The following features streamline the website creation process with Copilot:
Create an AI-generated site using Copilot
Create an AI-generated webpage using Copilot
Add an AI-generated form using Copilot
Add an AI-generated multistep form using Copilot (preview)
Add AI-generated text using Copilot
Ask Copilot questions
Create an AI-generated color theme using Copilot
Reference:
https://learn.microsoft.com/en-us/power-pages/configure/ai-copilot-overview

Explanation:
Box 1: No
It is recommended to use standard connector if it is available, but we can use custom connector even standard connector available.
Box 2: No
We can use custom connectors in power apps as well as flow.
Box 3: No
It is possible to use both standard and custom connectors in the same app or flow.

After you build a canvas app that addresses a business need, specify which users in your organization can run the app and who can modify and even re-share it.
https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/share-app

Explanation:
Box 1: Yes
Canvas offers two ways to access your courses a mobile app or web browser. Accessing the Canvas website on a desktop or laptop with a compatible browser will give you the best overall experience.
Box 2: No
After you build a canvas app that addresses a business need, specify which users in your organization can run the app and who can modify and even re-share it.
Specify each user by name, or specify a security group in Azure Active Directory (Azure AD). If everyone would benefit from your app, specify that your entire organization can run it.
Note: If your app connects to data for which users need access permissions, specify security roles as appropriate.
Box 3: Yes
Users may want to view data in relation to a table in a range of ways. A drop-down list of views is frequently displayed in the application so these can be selected.
Personal views are included above the list of system or public views that are available in the app.
This makes it easier for users to find the data that is important to them.
Note: Personal view - Personal views are owned by individuals and only visible to that person unless they share their personal views with others.
Any user can create dashboards visible only to them in their work area, such as sales, service, or marketing. An administrator or customizer creates or customises system dashboards that, when published, are visible to everyone in the organization. A user can choose to set their user dashboard as their default dashboard and override the system dashboard.
Reference:
https://docs.microsoft.com/en-us/power-apps/maker/canvas-apps/share-app
https://www.futurelearn.com/info/courses/cloudswyft-msft-dynamics-365-using-power-platform- ap/0/steps/208105