Mo,

There are just too many, covering an awful lot of territory, to be able to make broad general recommendations.

That being said, the following add-ons are "must haves" because of how they enhance NVDA's core code or applications you may be using:
1.  Add-On Updater.
2.  Add-Ons Documentation
3. Mozilla Apps Enhancements  (if you use Thunderbird and/or Firefox)
4.  Windows App Essentials

You can explore, and obtain, NVDA add-ons from the following two sites:

NVDA Community Add-Ons Site

NVDA Add-Ons Directory (hosted by the Spanish-Speaking NVDA Community Association)

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Brian - Windows 10, 64-Bit, Version 21H2, Build 19044  

The real art of conversation is not only to say the right thing in the right place but to leave unsaid the wrong thing at the tempting moment.

        ~ Dorothy Nevill

It all depends on what you're using NVDA for. Personally, I only run
three addons, and am probably going to remove one. They are Numpad Nav
Mode, Addon Updater, and NV Speech Player, though that's the one I'm
thinking of removing as I don't like its voice. Addon Updater is the
essential one if you're running any addons, otherwise it really
depends on how you use the program.

I find Toolbar Explorer very useful for unknown software. I also like the sound theme manager formally 3D sound etc, as it adds audio to a stereo sound to help understand some screen layouts.

Most of the others are more specialised and not used much, but the various addons that announce cut paste, copy etc, can be handy if you are used to that. None of those I've tried is perfect, since there are so many pieces of software that expose the info in an ambiguous way.
Brian

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