ELI5 attempt:

Your genes are a recipe book, not a blueprint. What recipe is chosen is based somewhat on environmental effects. When you reproduce, you pass on the book + the earmarks on the pages.

In your comment, the word "Explicitly" is the controversial part. Of course a memory cannot be _explicitly_ (like .mp4? lol) encoded in genetics. But effects pass on, or so says the field. It's the same as how the word "Memories" in the title is doing a lot of hand-wavey hype generation. Can I share a password or birthday party during intercourse? Of course not.