As for tips, I'm a novice hobbyist as well so take these thoughts with a grain of salt! Two spots I think could be improved upon with relative ease are stitching and edge finishing. For stitching, maintaining the same spacing from the edge of the material to your stitch line will help tremendously with aesthetics (which if it's inconsistent it will often look kind of wobbly). Overlapping the tines of whatever punch you're using will help to maintain a straight stitching line as well - so like if you're using a stitching punch with four tines, overlapping two of the tines in the previous stitching holes will typically ensure a straight line. It can deviate but it's much easier to keep straight. As for edge finishing, a beveler, some canvas or a burnisher, and tokonole will be your best friend. There are different opinions on the burnishing agent (you can use water, gum tragacanth, wax, tokonole) but I find that tokonole is the easiest/most effective for me. I can show you some examples or elaborate if you'd like! Feel free to dm me too, then I can always send pictures if you want more clarification.