Well, I was completely stumped as to what to write about at first too. I am 100% amateur and have no education on anything you can use to make RPGs (writing, graphic design, publishing, marketing, etc) and I don't know how to use any fancy programs like Photoshop or Affinity that I keep seeing people mention all the time in the TTRPG discord I'm part of. I was sure I had nothing I could share.
But then I remembered a friend recently asked me which program I had used to make the Lasers and Feelings version of Adiotopia and I just chuckled and replied "Microsoft Word?". That made me realize that, sometimes, we might be missing out on some features of the very basic programs we use to work everyday.
And so that's what I decided to write about. If you're an amateur, which free resources out there might be of use to you? And what neat tricks can you come up in programs such as MS Word that make your document more than just "a blank canvas with black letters?"
Ultimately, just stop and think what sort of knowledge or resources do you use when creating your TTRPGs and share that with the community. :)