Pinterest board for the book Marty McGuire Digs Worms--a book we have in our library. Kate lists a review, information about the book, a Twitter book club link, and lots of information about worms, composting, Earth Day, and activities.
You can search for Pinterest boards when you are searching for information about a topic or to find classroom resources on a topic. Searching for the search terms Pinterest and 2nd grade listed about a dozen teacher sites with 2nd grade as a theme. Search for early literacy, math games, French revolution, whatever.
When you find resources you want to share--maybe with students or parents--create your own boards with your curated resources. You don't need any tech expertise to use Pinterest, just some things you'd like to find and share.