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Make sure you get supporting evidence. A lot of people post connections on genealogy websites, but don't have the backup material to prove it. and some of it is based on rumour.
I have one ancestral line where someone keeps insisting that a man married an 'Indian princess'. and another that traces back to a medieval royal line in France, but it's just one researcher who has decided that so and so is the daughter of this duke without any real proof.
The internet has made genealogy easier and fun, but not very reliable as actually tracing the records yourself.