Here are the coordinating conjunctions (FANBOYS) matched with their correct uses:

F = **For** - give reasons (similar to 'because')
A = **And** - join two related ideas (the ideas do not contrast)
N = **Nor** - join two negative ideas
B = **But** - show contrast between two ideas
O = **Or** - join two different choices
Y = **Yet** - show contrast between two ideas
S = **So** - show results