I am really confused with these terms , already searched on web got the primary informations. But don't know why it is important ?

Anyone there could explain it fully ?
- saw this message in a thread where all were pasting there Bitcoin address , please explain
-saw this message from a legendary member advising before buying account , (ask for signed message and stake address )tell me the full concern ?
-is it a precaution of hacking ?

I have no knowledge in this, any senior member please help.

[Hello Theymos,]

My friend wants to send this message to theymos (Administrator)

Hello Theymos,
 
I am appealing from my friend's Bitcoin talk account. I got from the forum it is hard to reach you through email.
Profile Link: https://bitcointalk.org/index.php?action=profile;u=1568370
Profile name: cryptorampage

Today morning i saw my account was banned from posting and sending personal message.
-Never played any bounty campaign
-Never did any spam on this forum
-Never send pm anyone for any kind of request
-Never did any trade
-Never traded merit

Still i might be wrong , please help me to find that error. And warn me about that , and give me the second chance.   To err is human, to forgive is divine. I urge serene condition and pray for my appeal. I love this forum and want to stay here.
I will try to improve my post quality more and obey the forum rules and regulations (i did the wrong un consciously ) . Some are saying me there is problem with one post , which may be copied. But i did it to give the right information. Rather than that please check my post , i never tried any spam or shit posting on this forum.
I don't need this bitcoin talk account not for earning money. Just to gather knowledge and solve my problems.

So the bottom line is ,I have done one wrong post (copying) completely unaware of the forum rule (for answering a thread accurately) . That was a bad day for me , i was mentally disturbed. I apologize and confront my sin in front of all. Never do anything which is against forum rule, even its once.

I know you don't have time to read this messege. Normally its hard to care 1 among millions. I did one mistakes while having unconscious mind over the forum rules , i promise i will take care from now on. Don't be so cruel mods, give me another chance.



cryptorampage
A fan of Bitcointalk Forum
Thank you

Actually i am posting for the appeal for my friend's account Ban appeal. As he can't post. Please reconsider it. He sent me the email -

Today morning i saw my account was banned from posting and sending personal message. Please sir ,
-Never played any bounty campaign
-Never did any spam on this forum
-Never send pm anyone for any kind of request
-Never did any trade or never trade merits

Still i might be wrong , please help me to find that error. And warn me about that , and give me the second chance.   To err is human, to forgive is divine. I urge serene condition and pray for my appeal. I love this forum and want to stay here.
Profile Link: https://bitcointalk.org/index.php?action=profile;u=1568370
Profile name: cryptorampage


Please give me a second chance sir, I will obey your every steps. Sorry sir , please give me one and last chance and tell what not to do.

He is a good writer, please reconsider it. Hopefully he will not do what may be wrong. But i am still confused. I saw his profile and found almost zero shitpost. Anyway still if it is personal revenge , he will obey everything , please help to recover him.