Progressive Web Apps (PWAs) are web applications that provide a native app-like experience to users. They are designed to work on any device and platform that uses a web browser. Here are some best practices, tools, techniques, and strategies that web developers can consider when creating PWAs in 2023:

1. Adapt to all browsers and devices: PWAs should be able to adapt to different environments and user expectations. To ensure compatibility, it's essential to test your app across various browsers and operating systems. Responsive design is crucial for PWAs to ensure the content is accessible on any screen size. Users should be able to access all features and content regardless of their device's screen size. By rearranging content at different viewport sizes, you can prioritize important data and actions. Ensure users can interact with your application no matter how they access your content. Support keyboard and mouse, as well as touch or stylus input methods. Make sure all your application features can be accessed through any input method.

2. Provide an offline experience: Users of installed apps expect them to always work; even when connected to a slow or unreliable network or when their device is completely offline. A custom offline page provides a more consistent experience across browsers and devices and keeps the user engaged with your app. You can provide a custom offline page by using a service worker to intercept network requests and respond with the custom offline page when the user is offline.

3. Use HTTPS: PWAs should be served over HTTPS to ensure that the user's connection to the server is secure. This is especially important when dealing with sensitive user data.

4. Use a service worker: Service workers are scripts that run in the background and can intercept network requests, cache content, and provide offline functionality. They can also improve performance by pre-caching resources and reducing the number of network requests.

5. Use a manifest file: A manifest file is a JSON file that provides metadata about your PWA, such as its name, icons, and theme color. It allows users to add your PWA to their home screen and launch it like a native app.

6. Optimize performance: PWAs should be optimized for performance to provide a fast and smooth user experience. You can use tools like Lighthouse to audit your PWA and identify areas for improvement. Some techniques for improving performance include lazy loading, code splitting, and caching.

7. Leverage new features and APIs: PWAs can leverage new features and APIs to provide an even better user experience. For example, you can use the Web Share API to allow users to share content from your PWA with other apps. You can also use the Web Push API to send push notifications to users.

I hope this helps!

I would suggest taking a look at Quasar Framework if you are planning a new PWA, I have used it for several years and it helps speed up development time.