The phrase "an important tip" is correct and usable in written English.
You can use it when you want to emphasize a piece of advice or suggestion that is significant or valuable.
Example: "Before you start your presentation, here's an important tip: practice in front of a mirror to improve your delivery."
Alternatives: "a valuable piece of advice" or "a crucial suggestion."
A new study offers an important tip to anyone looking for forgiveness.
First stop was the management office, an important tip I learned from the outlet's Web site (www.tangeroutlet.com/westbrook).
But not today, thank God! Instead, I will now reveal an important tip you really have to know.
I never change the routine – and that's an important tip as well – never suddenly change on the morning of a race.
But this does bring us to an important tip: When citing someone as a potential role model, always keep your commendations narrow: "Sara Evans's last album is an example of good American values".
By mid-March they derived their first estimates of the code, and -- with clever detective work and an important tip from Montenbruck -- published final versions on their Web site (http://gps.ece.cornell.edu/galileo) on April 1.
She realised this was an important tip-off and noted it down on a yellow Post-it note.
This, again, signals declining cost, says Zindler. "The technologies have reached an important tipping point in a number of markets in the world," he says.
This is an important tipping point and probably presages the end of phone-based service as the primary channel for customer service interactions.
"We are at quite an important tipping point in terms of trans equality, and we are looking at how we can best support and maximise that tipping point," she said.
"This is an important tipping point," said William H. Frey, the senior demographer at the Brookings Institution, describing the shift as a "transformation from a mostly white baby boomer culture to the more globalized multiethnic country that we are becoming".
