Begin with what the family already knows
Start with yourself and work backwards one generation at a time. Record names, places, approximate dates and who supplied each memory, but treat family knowledge as a lead until a record supports it. Mark living people as private and avoid publishing contact details or sensitive family information.
Confirm each step with the strongest available source
Look for birth, marriage, death, census, parish or household records that connect one generation to the next. Save the archive, collection, volume, page or image and a stable link. When records disagree, keep both statements and investigate the difference instead of silently choosing the tidier value.
Turn gaps into research tasks
Write a precise question for every missing relationship, date or place, note which collections you searched and record negative results. A research log prevents repeated work and makes it easier for relatives or professional collaborators to understand what remains uncertain and what should be checked next.