I am not a designer, at the moment I am developing a web application like Sololearn, please pay attention to these pictures .. I do not want to hard copy this design, but I need examples of designs for such purposes as I can find similar designs or what I search in Google

One of those art-and-science processes, web research requires both an intuitive grasp of how the Web talks about itself and a variety of reliable instruments. If you only have the knowledge, you won't get any outcomes; if you only have the resources, you'll get a tonne of mostly useless ones. The Rock will turn up more results for Dwayne Johnson and Nicholas Cage than for a certain island prison off the coast of San Francisco, but I'm afraid I can't offer you the grok (search pattern matching) you need to understand this. I can provide you the second half, which is the toolkit.