What are the necessary materials and steps required to build a 10x12 deck in my backyard?

To build a 10x12 deck in your backyard, you will need the following materials: pressure-treated lumber, concrete footings, joist hangers, deck screws, post anchors, and decking boards.

The steps to build the deck include:

1. Obtain necessary permits and check local building codes.
2. Mark the deck layout and dig holes for the footings.
3. Pour concrete into the holes and set post anchors.
4. Install the support beams and joists using joist hangers.
5. Attach the decking boards to the joists using deck screws.
6. Add railings and stairs if desired.
7. Apply a weatherproof sealant to protect the deck.

It is recommended to consult a professional or reference a detailed deck-building guide for specific instructions and safety precautions.