If you are on Windows 10 you can simply press NVDA+R to use the built-in OCR, no add-ons required.

To find these, go to the NVDA menu, then tools, then manage addons, and on any item in the list, tab until you find the get addons button.

I would suggest Windows 10 App Essentials, control usage assistant (unless you believe your skilled enough not to need it any more) , speech history, review cursor copier (you'll need to assign your own keystrokes for the functions you want via input gestures) image describer, addon updater, clipspeak, no beeps speech mode, and possibly ObjPad if you find it makes things easier.

Speak passwords is another potentially useful addon if you use headphones almost exclusively.

Insert Emoticons may be helpful to you if you often find your self using emoji outside of a chat client with it's own emoji panel, but the selection is limited.

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The others are mostly specialized for certain programs or situations, such as golden cursor or indent nav or character information.

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If any give you trouble, hit NVDA Q and choose restart with addons disabled, then just start disabling one by one until you find the problem addon and remove it.

You can google and there is a website with a whole bunch of add ons, if u want a link I can find it tomorrow when I’m on my pc again 

For Reddit, get $1 which lets you jump between comments of the same indented level among other things.

There's also a Bluetooth one. I love this one, even more so as someone who uses hearing aids. Almost all Bluetooth devices will disconnect after a few seconds to save the battery life of the aids, but it will flip the speech when it connects again. This this addon stops that from peppermint by giving you a period of time before your hearing aids disconnect from the pc.