For each successful build, take a photo, note the current draw, input/output waveforms, and any modifications. Add this to your personal "1001 Circuits – Better Edition" PDF. Within a year, you’ll have a custom resource more valuable than any generic download.
When a circuit from the PDF fails (and it will), post to r/AskElectronics or EEVblog forums . But here’s the trick: Don’t ask "Why doesn't this work?" Ask a better question: "The voltage at Q1 collector is 0.2V, but the schematic says 4.5V. Is Q1 in saturation?" That question proves you are building a better understanding. 1001 practical electronic circuits pdf better