The phrase "tip number" refers to a piece of advice or suggestion that is numbered or categorized. It is often used when giving multiple tips or recommendations, making it easier for someone to refer to a specific piece of advice. Full definition
• Tip # 2 - Build your diet around nutrient dense foods, especially protein In tip number 1 we looked at what to start avoiding. (tomcoffeyfitness.com)
Or, the «Not in the near future» response if you're still single (see tip number one above for more on that approach). (policygenius.com)
If you're shorter, I'd opt for a shorter oversized sweater and then follow tip number three. (thefoxandshe.com)