Start by measuring and marking the locations for the posts. Determine the placement by adding 10% of the overall length of the shade sail. For example, if the shade sail is 3 meters, measure an additional 300 millimeters.

Based on the shade sail and post sizes, dig holes that are 400 millimeters square and 800 millimeters deep.

After digging the holes, add 100 millimeters of road base as the foundation for the footings.

Place the posts into the holes, angling them at 5 degrees for stability.

Mix concrete with water in a wheelbarrow, then pour it into the holes containing the posts.

Once the concrete sets, measure an equal distance from the top of each post, mark the center, and pre-drill through all marked points.

Attach anchor fittings through the holes of one post, then tighten using a spanner.

With the eyelets in place, attach the turnbuckle onto the eyelet. Hook the shade sail onto the turnbuckle and tighten.

The final result is a properly installed shade sail, providing protection against the natural elements.