Banner and Signage
While designing the Google banner ads I didn't face many problems. Figma is one of my favorite apps. Many thanks to @bruno for creating the logo(got it from the Figma community)
The mockup of Google banner ads are in four different sizes: 336x280, 300x600, 728x90, 970x90
Now I know a lot of best practices for creating signages. Let me mention some - simple and clear layout, proper pixels, color contrast, clear 'call to action' et cetera. Thanks to @screencloud for writing such useful tips. It saved me so much time and energy.