Some good ideas in that video.
My favorite vegetable dish is roasted beets and carrots, dice up equal amounts by weight of beets and carrots trying to keep the chunks similar in size to each other. Mince several cloves of garlic and the leaves from several sprigs of Rosemary and add them, a couple tablespoons of oil and a couple tablespoons of butter to a microwave safe dish and nuke it for 30 seconds. Poor over beets and carrots and toss to combine. Put in the air fryer at 400F for 15-20 minutes until it reaches the level of tenderness you want. You can cook it in the oven if you want instead, but it will take a lot longer to cook due to the oven needing to heat up a larger volume of air before you can start the actual roasting.