Help please

I'm new to arch linux. I've only been trying for two days to figure out why my Internet is either working or not. Why is it not in the terminal, but in the browser? Well, this is just an example, so that you understand how much everything is lost. I have a few questions. There are a lot of customizations on the Internet, but it's not clear how to install them, just a link to github and that's it. Could you help me with this, and if possible, describe everything in detail. Also, can you please help with the layouts. I want both Russian and English to be available and they change when pressing Ctrl and shift. Please help me.