“Indeed Allaah has commanded with excellence in everything.” This refers to our dealings with people, animals and everything that we do.
“When you execute” is an encouragement to kill animals for recreation.
“then sacrifice with ihsaan” refers specifically to giving up food that we love.
Causing the least amount of harm and alleviating suffering
Using a wooden stick rather than a knife
Sharpening a blade before killing an animal for meat
Being gentle when you lie the animal on its side
Sitting on the animal’s neck
Not constraining the animal’s limbs
“[The reward of] actions are only in accordance with their intentions…”
“While we were sitting one day…” (Hadeeth of Jibreel)
“The religion is naseehah (sincerity and sincere advice)...”
“Indeed Allaah is good and pure…”
Calling on the Prophet sall Allaahu alaihi wa sallam for help
Hoping for Allaah’s Extensive Mercy
Doing the things Allaah commanded and staying away from the things He prohibited
All good manners are obligatory all the time (and never just recommended)
Good manners refer to things you do (actions) not things you say (speech)
Something that one person considers good manners might not be considered good manners by someone else.
With regards to interacting with people in a fine manner, then the Prophet sall Allaahu ‘alaihi wa sallam left the mode and manner unrestricted.
Advice about what constitutes good manners can be sought from the people of intellect because they will have knowledge of that.
Here's an interesting quiz for you.