How to avoid Tattling Hurting someone physically, Mentally, Verbally is a sin according to Buddhism. As I believe no matter we love or hate each other, anyhow we don't have any ownership of any others lives. 


So how about Gossiping or the tattling about others lives ? 
How does Buddhism explain specifically about TATTLING ?? 
How one should practice not to Gossip about others lives ?  
In the other way how one should practice to face others Gossiping about
himself/herself ?
So how about Gossiping or the tattling about others lives ?


You are wasting your time and others time. Talk that is productive towards betterment of oneself, which lacks proper reasoning (mud slinging), if you are monk not connected with the goal, the pratice, the Dhamma or Vinaya.


  How does Buddhism explain specifically about TATTLING ??


If it is to divide people then it is not right speech. Also it should not be with malice, but say you are a witness of a wrong doing then perhaps might have a social or legal or moral obligation to report it but even this case some aversion arises as you are averse to the fact that something does not fall to your moral, social or legal idea but in society, work and as a householder you have to do these things sometimes. 


  How one should practice not to Gossip about others lives ?


If it can be an example to others then maybe it is OK. Otherwise change the topic to something productive or something you can learn from. 


  In the other way how one should practice to face others Gossiping about himself/herself ?


If you can learn something from it then try to. Sometimes in Business and Work situations you have to promote or market yourself and also engage in chatting to a maintain cordial relationships. This is not unproductive endeavour or killing time by chatting. 

Even in a personal situation you what you have to see if the chatting is directed at achieving something productive to yourself and listeners. Does it help you understand something better. Is there something listener can lean by a situation some one else has been in. If it is wasting time try changing the topic or move on it it is not inappropriate or rude. For a householder trying to build relationships, networking and friendships is productive and endeavor, even at a personal level, hence may not be idle chatter.