I use OneNote for most my bookmarking activities these days. I particularly like using the OneNote web clipper to save entire articles without saving the related sidebar content or headers and footers from a webpage. Here's a little overview of how I use it.
StayFocusd (intentionally misspelled) lets me set time limits for accessing the websites that I'm prone to wasting time on (Facebook, Twitter, and CyclingTips). With StayFocusd installed in Chrome I can set a daily time limit for the sites I tend to waste time visiting. When I reach that time limit I'm blocked from visiting that site for 24 hours. A little countdown timer is shown when I do visit the sites on my list. I wrote a bit more about StayFocusd a couple of years ago when I went on a Facebook faste.
This is one that I just started using last week and I already love it. Mote lets me add voice comments to Google Classroom and Google Docs. It also makes it very easy to add audio recordings to Google Slides. I published a few videos about it on my YouTube channel. You can watch the one about using Mote in Google Slides right here.
Loom and Screencastify
I make the majority of my screencast videos on a Windows 10 computer with Screencast-o-matic's desktop recorder. But when I need to make a screencast on a Chromebook I use either Loom or Screencastify. I publish a comparison of the two here.
When I need to create annotated screenshot on a Chromebook, Nimbus Screenshot is the tool that I use. I've been using it for years and it's always worked well. Here's a little overview of how it works.
How to Manage Chrome Extensions
I don't always remember to remove the extensions that I'm not using. I'm going to do it now that I'm thinking about it. From a security standpoint, it's a good idea to remove the extensions that you're not using on regular basis. Here's how to manage Chrome extensions.