When you use a browser, like Chrome, Firefox, Safari, Brave, Edge - it saves some information like images and login info from websites in its cache and cookies. Clearing them fixes certain problems, like logging in or rendering the site. 

Chrome

1. On your computer, open Chrome.
2. At the top right, click More .
3. Click More toolsClear browsing data.
4. At the top, choose a time range. To delete everything, select All time.
5. Next to "Cookies and other site data" and "Cached images and files," check the boxes.
6. Click Clear data.

Microsoft Edge and Internet Explorer

Go to the three-dot menu (. . . ) in Microsoft Edge and select 

Settings > Privacy & security; 

in the fly-out menu, click the button under Clear browsing data that reads "Choose what to clear."

Here you can get rid of browsing history, cookies, cached data, stored form data, saved tabs, media licenses, website permissions, and stored passwords; 

click Manage Permissions and you can delete things like sites you've given permission to show pop-ups.

You can't delete just one chunk of data from a time period like a day or week, but there is the option to "Always clear this [data] when I close the browser." That ensures you have no browser history stored, as long as you close the browser regularly.

Mozilla Firefox

In the latest version of Firefox go to the hamburger menu () and section Options > Privacy & Security.

You're instantly in the Content Blocking section; scroll down to get to History. Set Firefox to remember, to never remember, or get some custom settings like remember history, but not cookies, or whatever.

This section also has a Clear History button. Click it to pick a time range to clear (1, 2, 4, or 24 hours—or everything), and what data to dump (history, logins, forms/search, cookies, and cache).

Check the Firefox Account section while you're in here—if you've signed on with a Mozilla Firefox account, your history (plus bookmarks, tabs, passwords, and preferences) may be synced with your other PCs and devices using Firefox, even on smartphones.

Safari

On macOS, Safari rules. Clearing your website visit history is simple: click Clear History in the History menu. 

Then in the pop-up, pick a timeframe for how far back you want to erase. This is doing a lot more than deleting the browser history, however—it also takes out your cookies and data cache.

You can instead click History > Show History to get a pop-up displaying every site you've visited, then take out sites individually, without losing the cookies and cache. Zap cookies by going into Preferences > Privacy; 

delete your cache by going to the Develop menu and picking Empty Caches. 

If you don't have a Develop menu in Safari, 

go to Preferences > Advanced and check Show Develop Menu in Menu Bar at bottom.