When something awes you, it fills you with strong respect and amazement. In other words, to awe someone is to impress them and fill them with wonder and joy.
If a singer awes you, or if you're awed by a singer's performance, that means the singer is incredible, and you feel a deep respect and appreciation for the singer's amazing talent. You sit in awe of this singer.
Things that amaze us and fill us with respect are "awesome." For example, the singer was awesome, and the singer gave an awesome performance. However, we've used the word "awesome" so much that its meaning has weakened. Awesome things are usually just "cool," "neat," "great," "good," or "fine." If you text me that you're coming over at noon, and I say, "Awesome!" then I really am glad that you're coming—but I'm not deeply amazed, or inspired with profound wonder.
So, when something inspiring and breathtaking really does awe you, and it really does amaze and impress you, then instead of calling it "awesome," you can call it "awe-inspiring." In the gif below, Patrick seems to be staring at something awe-inspiring. Maybe it's a coral reef that's glimmering with a rainbow of species. Maybe it's a seven-layer birthday cake with gorgeous icing and sprinkles. I don't know, but if something makes you stare in wonder and amazement, and it inspires you with awe, then it's awe-inspiring.
And Patrick there is awestruck. That means it's as if he's been struck, or smacked, by the utter amazement of whatever he's looking at. Say that you're awestruck by something when it fills you with awe.
For example, I would be awestruck by a double rainbow.