Most scripts, images and other media related to an HTML page are referenced relative to the location of the page.
If the page is on a website, the browser will look for the media at the website.
If the page is on your file system, the browser will look for the media at your file system.
Since you only saved the HTML page, not the related media, the page won't work. Besides, many sites today use dynamic content generated on the fly, which is regenerated and requested each time you visit the website, and thus is not going to work from your local file system.
Don't waste your time on such silliness. Build your own website. Learn how the web works.
If the page is on a website, the browser will look for the media at the website.
If the page is on your file system, the browser will look for the media at your file system.
Since you only saved the HTML page, not the related media, the page won't work. Besides, many sites today use dynamic content generated on the fly, which is regenerated and requested each time you visit the website, and thus is not going to work from your local file system.
Don't waste your time on such silliness. Build your own website. Learn how the web works.