What is best practice on google page speed insight?

Google PageSpeed Insights is a tool that provides website performance optimization recommendations and scores your website on a scale of 0 to 100. To achieve a high score on Google PageSpeed Insights, the following best practices can be helpful:

Optimize images: Compress and resize images to reduce their file size without sacrificing quality.
Minimize CSS and JavaScript: Minimize the number of CSS and JavaScript files used on the page and optimize their size.
Use a Content Delivery Network (CDN): Serve static resources from a CDN to reduce the latency of loading resources from different geographic locations.
Enable browser caching: Store resources locally in the browser cache to reduce the number of round trips required to render the page.
Minimize HTTP requests: Reduce the number of HTTP requests required to render the page by combining multiple files into a single file and using CSS sprites.
Minimize the use of blocking resources: Avoid using resources that block rendering, such as synchronous JavaScript or CSS files.
Use asynchronous loading for JavaScript: Load JavaScript asynchronously to prevent it from blocking rendering.
Use progressive rendering: Render the above-the-fold content of a page as quickly as possible and defer the loading of below-the-fold content.

Use a fast hosting provider: Choose a fast and reliable hosting provider to ensure your website loads quickly for all users.
Avoid using unnecessary plugins: Minimize the use of plugins, as they can slow down your website and affect its performance.
Defer unused CSS: Load only the CSS that is needed for the above-the-fold content, and defer the loading of unused CSS to improve the initial load time of your page.
Minimize the size of above-the-fold content: Make sure the size of the content above the fold is as small as possible, so that it loads quickly for users.
Minimize round trips to the server: Minimize the number of round trips to the server by combining multiple files into a single file where possible.
Optimize fonts: Optimize the size and format of font files, and use font-display: swap; to ensure that text appears quickly, even if the custom font file is not yet loaded.
Use a fast DNS provider: Choose a fast and reliable DNS provider to ensure that users can access your website quickly.

Minimize redirects: Avoid using unnecessary redirects, as they can slow down your website and negatively impact its performance.
Use Gzip compression: Use Gzip compression to reduce the size of your HTML, CSS, and JavaScript files, and make them load faster for users.
Optimize the order of styles and scripts: Load stylesheets first and scripts last, to ensure that the visual content of your website loads as quickly as possible.
Use lazy loading: Lazy load images and other content that is not immediately visible to users, to reduce the initial load time of your page.
Monitor your website performance regularly: Regularly monitor your website's performance using tools like Google PageSpeed Insights, to identify areas for improvement and make updates as needed.

Avoid using heavy animations: Avoid using heavy animations and other interactive elements that can slow down your website and negatively impact its performance.
Use a fast framework: Choose a fast and lightweight framework for your website, to ensure that it loads quickly and provides a good user experience.
Avoid using blocking JavaScript: Avoid using JavaScript that blocks the rendering of your page, as this can negatively impact its performance.
Use HTML5 instead of Flash: Use HTML5 instead of Flash for multimedia content, as HTML5 is faster and more lightweight.
Use CSS instead of images: Use CSS to create visual effects and designs, instead of using images, as CSS is faster and more lightweight.

Use caching: Implement caching strategies for your website, such as browser caching, server caching, and object caching, to reduce the amount of data that needs to be transferred and improve load times.
Minimize the size of above-the-fold content: Make sure the size of the content above the fold is as small as possible, so that it loads quickly for users.
Minimize the use of custom fonts: Minimize the use of custom fonts, as they can slow down your website and negatively impact its performance.
Avoid using large background images: Avoid using large background images, as they can slow down your website and negatively impact its performance.
Use modern technologies: Use modern technologies, such as HTTP/2 and Brotli compression, to improve the performance of your website.

Minimize the use of custom JavaScript: Minimize the use of custom JavaScript, as it can slow down your website and negatively impact its performance.
Minimize the size of JavaScript files: Minimize the size of JavaScript files by removing any unnecessary code, comments, and whitespace.
Minimize the size of image files: Minimize the size of image files by using appropriate file formats, such as JPEG and PNG, and by compressing images.
Optimize images for the web: Optimize images for the web by resizing them to appropriate dimensions and reducing their file size.
Use a content delivery network (CDN): Use a content delivery network (CDN) to distribute your website's content globally and improve its load times for users in different locations.

Use responsive design: Use responsive design to create a website that adapts to the screen size and orientation of different devices, ensuring a fast and consistent experience for all users.
Minimize the use of plugins: Minimize the use of plugins, as they can slow down your website and negatively impact its performance.
Use a fast and reliable hosting service: Use a fast and reliable hosting service, such as a cloud hosting or a dedicated server, to ensure that your website is always available and loads quickly for users.
Minimize the use of heavy JavaScript libraries: Minimize the use of heavy JavaScript libraries, such as jQuery, as they can slow down your website and negatively impact its performance.
Optimize the structure of your website: Optimize the structure of your website by organizing its content into clear and concise categories, and by using a clear and intuitive navigation system.

By following these best practices, you can help ensure that your website loads quickly and provides a good user experience for all visitors. Regular monitoring and optimization can also help you maintain a high score on Google PageSpeed Insights over time.