Hand tools I still use
Hand saws, chisels, files, and fixed wrenches appear in almost every entry because they are the ones I have hanging on the panel and the ones that handle 80% of the jobs. When a tool breaks or disappoints me, I write about it anyway. There is no commercial agreement behind it: it is what is on the workbench.
Supplies from the neighborhood hardware store
Screws, wall plugs, wood glue, solder, flux, and electrical tape come from the nearest hardware store. I do not work with exclusive brands or recommend one over another without having tested it on a specific project. If a supply failed, the note says so by name.
Materials that keep coming back
2x4 lumber, copper pipe, cables of known gauge, and bicycle inner tubes are the materials I use most across carpentry, electrical work, soft soldering, and bike maintenance. I name them with their measurement and use because that's how the step-by-step makes sense, not because anyone sponsors them.
Readers who contribute corrections
Several entries were adjusted after someone wrote in pointing out a measurement error, a risky procedure, or a simpler alternative. That back-and-forth is the only kind of collaboration that appears in this notebook, and I find it the most useful of all.