Getting started securing my network

The recent news on LG TVs spying on people made me fall into the rabbit hole of securing network communications. Right now my situation is extremely precarious - I own an aforementioned TV, as well as a desktop PC, both connected directly to the ISP Modem via Ethernet. Then there's a lot of Wi-Fi devices connected, with it being a small apartment reach hasn't been an issue. I'd like to get a cheap-ish router that I can use to secure and monitor network traffic, but I'm reading a ton of terms that I'm unfamiliar with, such as Omada, Unifi, openWRT, controllers, VLANs, etc. I read the FAQ here but am still rather lost. What should I be looking for and how can I get started securing my network?