As-salamu ‘alaykum wr wb (Peace upon you and the Mercy of God and His Blessings…
Choosing a friend or friends is more important that you or I might have know it to be..
Muhammad sws said: “if you want to know a person, look at his / her friends”
and a person is on the religion of his / her friends…..
I pray this advice is a benefit to myself and then to others, ameen…
Al wal’a wa Al bar’a (link)
THE MANNERS OF COMPANIONSHIP (link)
Shaykh Badrud-Deen al-Ghazzee (d.984H) 
The Shaykh - rahimahullaah - said, 
Know O pious brother - may Allaah make our affairs good - that the manners of companionship and good relationships are of various types, of which I will explain, such as will show the person of intellect the manners of the Believers and the Pious; and come to know that Allaah the Most Perfect, the Most High has made them a mercy and helpers towards each other, which is why the Messenger of Allaah (saws) said, ‘‘The example of the Believers, in their mutual love and mercy is like the example of a body, if one part feels pain, then all of the body suffers in sleeplessness and fever.’’ 
And he (saws) said, ‘‘The Believer to the Believer is like a solid building, one part supporting the other.’’  The Prophet (saws) also said, ‘‘The souls are arrayed armies, so those who knew each one another before, will be friendly…’’  So if Allaah intends good for His servants, He grants them companionship of the people of the Sunnah, righteousness and adherence to the Religion; and keeps him free from the companionship of the people of innovations. The Prophet (saws) said, “A person is upon the religion of his friend, so let every one of you look to whom he keeps as a friend.’’ 
About a person, do not ask, but ask about his companion; Since every companion follows his friends.’
From the manners of companionship:
Good manners with the brothers, peers and companions, following the Messenger of Allaah (saws) as he said, when it was said to him, ‘What is the best of what a person is given?’ So he replied, ‘‘Good manners.’’ 
MAKING ONE’S OPINION GOOD:
From the manners of companionship is behaving well regarding the faults that he sees of his companions, since Ibn Maazin said, ‘The Believer seeks excuses for his brothers, whilst the hypocrite seeks out their faults.’ And Hamdoon al-Qassaar said, ‘If one of your brothers commits an error, then seek ninety excuses for him, and if not, then you are the blameworthy one.’….. click link to see all txt on this topic (Iink is at top of article)