QUES: From within the content all the complexity of the standards is abstracted the developer doesnt even have to know which standard is in use

correct the punctuation.

CORRECTED: From within the content, all the complexity of the standards is abstracted, the developer doesn't even have to know which standard is in use.

QUES: There are realities that are so great they cant be reduced to fun

correct the punctuation.

CORRECTED: There are realities that are so great they can't be reduced to fun.

QUES: Did someone email you a CARD file and youre not sure how to open it Maybe you have found a CARD file on your computer and wondering what its for Windows might tell you that you cant open it or in the worst case you might encounter a CARD file related error message

correct the punctuation.

CORRECTED:
Did someone email you a CARD file and you're not sure how to open it? Maybe you have found a CARD file on your computer and wondering what it's for? Windows might tell you that you can't open it, or in the worst case, you might encounter a CARD file related error message.