I do not know the difference between the following words:
•"um" and "über"<--- I don't know the difference between their use as "about".
•"als" and "denn" <--- I don't know the difference between their uses as "because", and "than".
And also, I am quite unsure if the notes I have taken from the following webpage are true, so if you are someone who knows enough to tell me wether these things are correct or incorrect, please do so!
http://germanforenglishspeakers.com/other/conjunctions/
I DO have questions about wether or not specific things on this page are correct, so if you want me to specify them, please let me know.