Positive feelings

Fortunately for me I know many people. I have good friends and, in general good relationships in all places including at work, at in my neighbourhood and inside of (mejor "within my family")  my family. My best friend is a university mate. Although we graduated 10 years ago we have maintained our friendship. He is a good man, capable in our professional field, smart and good confident. When he sets out to do something, he generally achieves it. We share professional activities and hobbies. Within our activities as electronic engineers are attending to different seminars and courses, supporting each other on specific developments or designs and sharing knowledge. Our hobbies are reading scientific articles in magazines or on web sites and then discussing them, playing football every weekend and encouraging our football team "Millonarios".

Excellent Luis, just look into el gerundio ingles.

Fortunately for me I know many people. I have good friends and, in general, good relationships in all places (everywhere) including at work, at in my neighbourhood and inside of with  my family. My best friend is a university mate. Although we graduated 10 years ago we have maintained our friendship. He is a good man, capable in our professional field, smart and good confident.* When he sets out to do something, he generally achieves it. We share professional activities and hobbies. Within Included in our activities as electronic engineers are attending to different  (various) seminars and courses, supporting each other on specific developments or designs and sharing knowledge. Our hobbies are reading scientific articles in magazines or on  web sites and then discussing them, playing football every weekend and encouraging (supporting) our football team, "Millonarios"

I am not sure whether you mean that your friend is very confident or a good confidant, meaning somebody you can confide in?

Good writing Luis!