1. I'd like to make a counterargement abainst the opposite team/opponent team.
(Can we use both terms, 'oposite' and 'opponent')
2. We can watch various lectures and sermons on TV. Many motivators appear on TV and help us to set our goals and prepare for the future. We need to learn a lot of things on TV. That’s essential to solve the problems and learn many things efficiently.
(Would you check this passage? Correct some errors, please. Thank you.)
"opposing team" would be a better choice, but opponent and opposite really mean the same thing.
"to solve the problems"? What problems? Whose problems? The phrase is too broad and means nothing. The problems of peace in the Middle East? The problems of the partition of the Korean peninsula? The problems of how to avoid procrastination in doing our homework? What problems?
Otherwise, your paragraph is fine.