1 A LACK OF SOURCES
Always be wary of trees with no sources attached, and never blindly copy them. If you can verify a person's research through multiple sources – which may already be attached to their tree – then this can help to prove the line is correct.
2 A GAP IN THE TRAIL
If an online tree appears to have solved your brick wall, always ask where the evidence is – even if multiple trees share the same information. It's entirely
