Tip of the Summer: you can email web articles & PDFs to your kindle by using the word “convert” in the subject line.
(Bonus: refurb waterproof Kindles are $100 on Amazon)
https://www.amazon.com/gp/sendtokindle/email
(Bonus: refurb waterproof Kindles are $100 on Amazon)
https://www.amazon.com/gp/sendtokindle/email
Save first to Files (or iOS will generically name the file Attachment-1). Following this step will make the file appear as article title on your kindle