If you us Google Chrome, click the right corner under the X (to close Chrome but don't close your browser, click under that spot) and all sorts of tools come up (new tab, incognito, etc.) and the bookmark tool. Click on bookmark and you usually figure it out from there. I recall that all the browsers I have used (Chrome, Internet Explorer, Firefox, etc) have a bookmark tool--usually you can click around to figure it out via exploration.

I use the bookmark tool all of the time. Some of my bookmarks have remained for years because they are so useful. I also have days where I am bookmarking lots of things I want to go back to but just end up deleting most of the bookmarks later because reading everything on the internet can be a bad use of time. The same thing goes for the YouTube watch later function.