Don't assume to have known much just because you have rank up, but exercise patience to learn well and be more useful to the forum, this will also help you have more quality post than chasing cloud.
This is not a rule but a timely advice to newbie who wants to keep their posting reputation in good standard.
One meaningful post is better than 15 to 20 post that are low in quality just to fulfill signature requirements.
Well even at Legendary rank, I cant still assume that I almost know everything, but in perfect sense I am not. Still learning few stuff outside of what Id already know. The rank might have achieved but the specific knowledge still on process. Same goes for other ranks. Staying on forum with an active participation keeps you learning things.
Signature is just a bonus to those posting equivalent especially if you share some valuable one.