Okay - okay… I was thinking that if I want to try to make a landing page for the site. I know html/css. What can you advise? I found a job that pays well))) so I'm wondering if I should give it a try.

Knowing HTML and CSS is not enough. You need much more than that. You need to know how sites are created, what people are involved, so you know what you need to learn. I will send you a web page that very well describes how to create websites https://www.3ptechies.com/custom-web-development.html . Look for information on YouTube. Or you can tell them at work that you want to do it and they will teach you.