I open a new window for each "topic" to keep the tabs grouped while keeping unrelated things separate.
I also use an extension (on my phone so can't lookup the name) to give names to each of these groups of tabs. Only the "main" window with it's tabs automatically starts up upon browser launch. For the rest of the named groups, the extension provides a button on the toolbar to "resume" any named group which launches its tabs in a new window. This workflow reduces startup time and only keeps those things open that I'm actively looking at.
I also use an extension (on my phone so can't lookup the name) to give names to each of these groups of tabs. Only the "main" window with it's tabs automatically starts up upon browser launch. For the rest of the named groups, the extension provides a button on the toolbar to "resume" any named group which launches its tabs in a new window. This workflow reduces startup time and only keeps those things open that I'm actively looking at.