As for RCA cables, pretty much any that are the right length will do, but stay away from the ultra-cheap $2 to $3 cable.

Amazon Basics are fine. But there are many others to choose from.

I like these - RCA

https://www.amazon.com/KabelDirekt-Digital-Theater-Blu-ray-receivers/dp/B00DI89I04

Optical Cables -

https://www.amazon.com/CableDirect-TOSLINK-optical-soundbars-amplifiers/dp/B00DI89VOM?ref_=ast_sto_dp&th=1&psc=1

But there are dozens to choose from.