Just a quick question is it possible to make those triangles off the edge be smooth or is it impossible Thank you
It’s called aliasing.
There are several anti-alias settings you can use in the project settings, you might have one enabled right now.
Have a tinker around with that, otherwise, no it’s not possible, because you are very close to the cube 
Hey there @Tsiqz! Clockwork is correct here, if you’d like to learn more about anti-aliasing, here’s the documentation page:
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At the top right, go to Settings>Engine Scalability Settings and set the anti-aliasing to high, epic or cinematic. Alternatively, check out your viewport resolution.