I use two of the corkscrew anchors mentioned above along with two rachet straps and two rubber type bungie cords looped over the awning roller at the top. The bungie cords allow you to put tension on the straps and keep them from coming loose. When camping on concrete, I replace the anchors with two 5 gallon buckets filled with water and covered with lids. I simply hook the rachet straps to the handles of the buckets.
2017 Salem Hemisphere 2009 Chevrolet 2500 HD 6.0 L
You'd do well to put the awning away when it gets windy and never leave the campground with the awning out. The straps won't hold if a strong gust hits it and they ultimately hinder extending and retracting the awning.
Any Dollar store carries the corkscrew tie-out anchors for less than $5.00 USD each, and I use ratchet straps that cost about $2.00 USD each. Keep the ratchets lubricated and they'll last a long, long time.
2022 Keystone Cougar 24RDS 2023 Ram 6.7L Laramie Mega Cab
You can buy awning straps that anchor to the ground at any rv store (or online) or just get 2 of the corkscrew type anchors used for securing dog leashes and some rope or a ratchet strap. Really only good for the manual awnings, the new power awnings shouldn't be strapped.
'17 Ram 2500 Crewcab Laramie CTD '13 Keystone Bullet Premier 310BHPR Hitched by Hensley