Wonky edges for a ripple blanket: Make sure you're putting the increases and decreases on the same stitches of each row, and don't forget your turning chains the end of the rows.
Beginner's tip: If you're trying a new pattern/stitch for the first time it can be really helpful to work up a test swatch first (to see how it will look and to help you get the hang of it) before making a partial blanket that you end up frogging.
Summer tops: Try a lace weight or use a double knit with a larger hook. 4-4.5mm will give you shorter stitches closer together with DK, whereas a 5mm+ hook will give you taller stitches further apart, so a more lacy appearance.
Alternative Aran weight projects: Scarves, hats, cushion covers, various blankets (try a granny square), decorative baskets, coasters, cotton also works for pan rests (acrylic will melt but cotton fine) in the kitchen, scrubbies, cloths, bathroom floor mats.
Places to go: Check out Bella Coco videos on YouTube And Attic24 is a brilliant blog.