For learning, I started out reading the book The Druidry Handbook by John Michael Greer and /r/druidism. From there I explored various parts of Druidism and some paganism that interested me--elements (not science elements, spirtual/symbolic ones like air/wind/fire/earth), tarot, and living with nature.

For rituals, you can choose how far you're willing to stretch your imagination: a contemplative walk in the woods, or trying to commune with trees. I started doing tarot cards as well, which for me is less divination and more perspective. It hacks your minds pattern matching and forces you to think about situations from a different angle. It can also be fun or intimate with other people. My family celebrates the wheel of the year which gives you tons of opportunities for fun festivals/connecting with each other and nature. All of the holidays fall outside of traditional Christian holidays, so it's really easy to celebrate them without upsetting your extended family as well.

I recommend having an open mind, I'm highly skeptical in general and definitely had to sift through stuff to figure out what makes sense to me. Which is OK with druidism, it's kind of like a Linux distro/DIY spirituality framework.