It starts with a foundation. Make sure it is sturdy. Leave no cracks. Smooth all surfaces. Keep it safe.
Then you can move onto the walls. Boundaries are necessary. Otherwise you just walk into everything. Do not use fiberboard, or materials that are cheap. Know your worth.
Keep your roof free from debris. Maintenance is necessary. Otherwise the shingles will rot. Keep your shelter weather resistant, so it will not blow over at the slightest breeze. Or even in a downpour.