Google Structured Date Errors with Magazine Basic Child

After I was turned down for Google Ads, I was trying to figure out why Google says they can’t figure out what my website is about and why they say I don’t have enough content when there is plenty of stuff on my blog. So, I went to the Google Search Console and saw that there are 469 items with errors. My questions for you are:

1) would errors like missing: updated and missing: author cause Google to say what they said? If not, why what can I do to make my website meet their standards for the ad program? Here is my web address: https://booksthathook.com

2) how do I fix the structured data hentry errors? All the advice I have seen involves editing php, but I don’t have a php file under appearance-editor. All that shows under editor is style.css and rtl.css.

I am running a child theme of Magazine Basic.

I don’t know how to use Filezilla or GoDaddy to edit anything.
Please help in a step-by-step way that I can understand, since I am a newbie. Thank you!