A4 versus US Letter
Six millimetres wider and eighteen shorter. It sounds trivial and it is the reason a merged revision pack prints with inconsistent margins and occasionally jams.
Guides
Working with PDFs, properly
40 guides across eight topics, written by four named people and tested against real documents. No article here exists to occupy a search result.
Exam papers as PDFsPast papers, mark schemes and the folder they live in.5 guides
Studying from PDFsTurning documents into revision you will actually do.5 guides
Reading PDFs on any deviceWhy PDFs read badly on screens, and how to fix it.5 guides
How PDF files actually workWhat is inside the file, and why it matters.5 guides
Printing PDFs properlyScaling, duplex, booklets and the fit-to-page trap.5 guides
Scanning handwritten workPhotographing paper so a marker can actually read it.5 guides
PDF privacy and securityEncryption, permissions, redaction and metadata.5 guides
When a PDF misbehavesDiagnosing the file rather than guessing at it.5 guides
Guides, page 4
When PDF pages are blank
Four causes, and they need four different responses. The one that matters most is the one where the pages are blank on paper but not on screen.
Printing double-sided
Long edge or short edge, and how the stack goes back in if your printer cannot do it itself. Both are worth establishing once on two sheets rather than on forty.
Saving paper and ink
Five changes, in order of how much they save. The first two do most of the work and neither of them costs you anything you were using.