From the perspective of some past disasters ...
Do be aware of wind. It will gust, particularly before a T-storm. We had a ($$$) retractable awning that got bent by the wind and we ended up with a wood frame and steel cables that could guide and restrain the awning when it went out. Double the effort (and $$$), but still retractable.
Rain! Awning or other cloth cover may look like it will be pitched to drain, but as the fabric ages a bit, the weight of the first rain may make it sag, collecting water, until your awning is a bulging bag of 100's of gallons. If all you want is a bit of shade, give serious consideration to using nursery shade cloth: tough mesh available in black or dark green. Lets in some light and air, and of course lets the rain through so you don't need to worry as much about how it is pitched and anchored. Can be custom fabricated with a reinforcing rope at edge and grommets. Not expensive.
Dirt. Any light colored fabric awning (e.g. sunbrella) or shade cloth show leaves, etc. that collect up above. Even a little looks bad with the sun behind it. Let it sit wet and it will glue to the fabric. If you have trees around, give thought to how you will clean it. With shade cloth, you can use a leaf blower from below, with modest success and makes an amusing show.