Variables?

What other variables will work for the feed? I’d like to do something about content scraping. Can I post the link to the original source (my site) with the feed post notice?

I was installing Add to Feed tonight until I realized I could do more (and eliminate other plugins) if I use Add to All instead. Your plugins never disappoint me. I’ve been using Contextual for years and have it as one of my favourites here.

https://ww.wp.xz.cn/plugins/add-to-all/