Choose your connections, posts and updates with purpose. Know with whom you are connecting and to whom you are communicating..
Have a reason other than trying to sell something. (Even if your reason is to sell something, do NOT sell until you have connected with them and have had an initial meeting or conversation.)
Quality applies to connecting etiquette as well. Be personal with your invitation. Have a reason based on their profile to connect.
As for updates, share something of quality. Resist the temptation that more is better.
What’s better is … better.
One quality connection with whom you meet or speak is of more value than 10 randomly added connections with whom you never interact again.
Grow your network one quality connection at a time.