I think this is a big part of it. At work, I am coding to one platform. For my personal projects - I set up the Linux server, I set up the MySQL/MariaDB insta

I think this is a big part of it. At work, I am coding to one platform. For my personal projects - I set up the Linux server, I set up the MySQL/MariaDB instance, I design the database schema which follows first normal form, second normal form. I design the REST API in Python, then I get to my normal job of coding an app for one platform. Plus I do the graphics, which normally the design group does. I also do the advertisement on Google Ads etc., I pay the bills and do the accounting and so on. So it goes beyond even tech skills. Thomas Huxley said a good liberal education is to know something about everything and everything about something. I am not an expert in creating ads on Google, Twitter etc., but I have done it and know something of it. Same with sizing or dropping graphical icons. Or designing a database schema. Or figuring out my side project cash flow, profit and loss, having my accountant help me set up an S corporation. This is all the knowing a little something about everything. In my day job I primarily use one programming language to target one platform. In this subject I go deep and really try to learn as much as I can. This is what my main focus is on, learning the language well, and learning the platform well. I should also point out, the smaller a company is, the more hats you will wear. I worked at a small company where I wore not only a programmer hat but a devops hat. I set up Google Cloud, Firebase Firestone, Apache web server, and wrote and modified Python scripts. At a larger company (where I am now), 99% of the time I do none of these things (actually they like I have these skills and can interact with our devops team). It doesn't take long for specialization to kick in either, by the time of the second tech hire you're already dividing up work. It is important to know your main focus well on job interviews though.