I recommend using H.265 and Opus for audio. In my opinion, encoding to H.264 in 2023 is not a wise choice. AV1 is a good option, especially with hardware encoding and compatible devices.
Some players can play rar files directly. Also look into rar2fs. I just try to avoid rars if possible
Ideally, all links should point to the original source, with bots or client-side code changing them for those who are interested.
They mean their .torrent files. Not the content itself (though some uploaders may say to wait a bit before reuploads)
I recommend using H.265 and Opus for audio. In my opinion, encoding to H.264 in 2023 is not a wise choice. AV1 is a good option, especially with hardware encoding and compatible devices.