This website is a reliable updated site with specific instructions on how to clear the cache for every browser:
Please follow the instructions below to clear your cache on your MAC: https://clear-my-cache.com/apple-mac-os.html
Please follow the instructions below to clear your cache on your WINDOWS: https://clear-my-cache.com/windows.html
What is actually the cache?
The cache, in computing, is a place where data is stored temporarily. As a user, you often use the cache when using a web browsers. When you open a website, its contents are saved on your computer. As a website visitor, you don't notice this process, because the saving is done in the background. In the web, this enables faster rendering and shorter loading times. The data which is stored in the cache are HTML files, stylesheets, scripts, images and other media files. If you navigate on a website back and forward, the browser doesn't have to download all the data again but gets the required files from the cache. The browser compares superficially what has been changed since the last visit so that only new files are downloaded.
Why do we have to clear cache?
The cache should be cleared regularly for several reasons. Depending on your settings, the cache can grow quite big and use a lot of disk space on your computer. And that's even if you don't visit some pages ever again. The more information that is saved in the cache, the slower your computer will be browsing the web. Deleting the cache data helps to troubleshoot, helps to increase the loading time of web pages and increases the performance of your computer.
If the browser doesn't load the new version of the site, even if there have been changes on the site since the last visit, the cache can cause issues with the view. The website might look like it has not been fully loaded or is wrongly formatted. Maybe you already wondered why a website is showing outdated contents, despite it having been updated. That's probably because of the cache. Sometimes data, which is stored in the cache prohibits loading of up-to-date contents. When you delete the stored cache data, the new version can be retrieved. In many website related issues, the cache is the root of all evil. That's why your web developer/web designer or IT-Support first asks you to clear the cache before investigating further.