There are actually many different blogs, portals and communities where you will find not only the necessary information and online lessons, but also professional help, for example, on the forum or in the chat, from other more experienced designers. I'm not sure if you haven't seen this site yet, but I would like to share the only portal where I found cool and free mockups that any designer can use to create his designs, thi https://www.ls.graphics/free-mockups/flyer-mockup s is where I needed the mockup. This greatly cuts down on the time spent on the layout and I'm confident that this flyer will be the standard size my client wanted.