Does anyone have any advice on what's the best tool or best ways to do mockups? this is where I struggle as a newbie

Just wanted to share how I download my designs from Canva with 300 DPI. When downloading my image, I save it as PNG with a maximum Size of 3.125. After that I always open the PNG file in Paint (on PC) and go File - Image Properties to check the resolution. If the PNG file is too big (more than 20 MB for Etsy), I resize it in Paint (Resize and Skew button) by reducing the Pixels untill my file is 20 MB or less. This does not change the DPI. So all my designs are 300 DPI or more, because that's what I promise my customers. Same trick can be used if you are using Kittl and the AI upscaled image is too big. You can reduce your design's size in Paint without loosing the 300 DPI resolution before uploading to Etsy. Happy designing!

Are there processing fees for digital products?

1: Dalle3 2: Ideogram v2 3: Flux.1 pro Prompt: On a white background, captivating and intricate watercolor painting of a butterfly's profile, with its wings skillfully designed to reveal a mesmerizing scene of a beautiful sunset over a serene lake. The sky is adorned with muted pastel hues, floral patterns, and decorative elements, creating a harmonious balance with the silhouette of the butterfly. The reflection of the trees in the water, along with the subtle watercolor splatters, adds a touch of vibrancy and movement to the piece, vibrant, dark fantasy, 3d rendering

I'm curious to see what everyone's favorite and must-have tools are. What tools do you find yourself using the most? What is worth paying for?