Almost everyone uses these 7 phrases incorrectly
1. That makes sense, of course
Nah, do not do it! It must read correctly: "It makes sense!"
2. To my knowledge ...
After the genitive there is no "after". It says "In my estimation Berlin is on the Spree (because this is a dative), but" to my knowledge Berlin is the capital ".
3. I have the same smartphone as you
The same really means exactly the same - there is only ONE copy. By contrast, "the same thing" means something that is very similar to hair, like two identical smartphone models.
4. That would of course be the most optimal
Since optimal is already a superlative, there can be no increase. Sorry!
5. That is expressly in the AGBs
AGB stands for "General Terms and Conditions" and that is already majority. So the "s" has to go!
6. I have paid over 50 euros
With numbers you always use a "more than". It must mean: "I have paid more than 50 euros!"
7. Unfortunately, the party is canceled because of the bad weather
Bastian Sick stated in his eponymous book: "The dative is the death of the genitive!" And, in fact, many use the dative for the term "because" - though it actually has to be the genitive. Correctly it says: "Unfortunately, the festival is canceled because of the bad weather."