SEC Rule 506C is a fast and cheap way to raise growth capital. It allows you to advertise.
Rule 506(c) is under SEC Regulation D. Regulation D is a "safe harbor" rule for private securities offerings. In other words, it gives easy to understand standards for what is permissible and what is not.
Reg D, Rule 506 offers two ways to make a private offering. Under
506(b) no advertising is allowed. Under 506(c) advertising is allowed
but only to accredited investor under certain rules.