Due diligence.
WHAT TO CHECK
The exact spelling The extension The expiry date Previous use Rights conflicts
THE PREVIOUS USE CHECK
A name used previously for spam or worse carries reputation problems.
Archive services show what a site contained historically.
Worth a few minutes on any name of value.
THE RIGHTS CHECK
Whether the name resembles an established brand or a person's name.
Buying such a name can result in losing it, and costs.
WHAT THE MARKETPLACE MAY FLAG
Where screening is available, it flags things worth investigating.
It is not legal advice and it is not a clearance. Take proper advice on anything contentious.
THE EXPIRY CHECK
A name expiring shortly means a renewal cost soon after purchase.
WHAT ELSE TO CONSIDER
Whether the name is easy to convey verbally Whether it works for your actual purpose
WHAT TO DO IF ANYTHING IS UNCLEAR
Ask the seller before committing.
WHAT NOT TO SKIP
The spelling check. It is the most common expensive error.