In coding, this means that specific pieces of code are responsable for a single purpouse, and one only. That makes sense. Imagine a pizzeria that makes spaghetti too. A nice pile of white spaghetti with a small-fry of sauce on the top. You don't want that!
You may have seen what I do: other than design, I also code and write. I'm not a pharisee: yes, I do not follow the SRP. It's more like a continuum for my workflow. I code to understand the challenges of a design solution. To save yourself time and money, because they're both valuable. I write things to better appraise your potential, 'cause you have a lot of it.It's just you don't have the knowledge to make the magics. And I'm here for that.