What are the features I should research when purchasing the right sound bar for my tv setup ?

Update: I am new to the sound bar world but am very eager to purchase the right one for my purposes . I will provide the details I know which will help you answer my question.My tv is a lg 4K 65 inch . https://www.lg.com/au/tvs/lg-65UH652T The specifications are on the website including audio options . I want to get the... show more I am new to the sound bar world but am very eager to purchase the right one for my purposes . I will provide the details I know which will help you answer my question.My tv is a lg 4K 65 inch .
https://www.lg.com/au/tvs/lg-65UH652T
The specifications are on the website including audio options . I want to get the most out of my tv for watching movies and shows in 4K and hd. Netflix etc . 4K stream from pc iPad Apple.
Room size 4x5 meters 13ftx16
What features on the bar should I look for ?
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