How can I decide when to use "e" or este?
There is no rule for that, so use it how you want. My teacher told e is mostly used when you already used este (not to say the full form again) or to shorten the speech.
What is repede? Even above here it says rapid??
Isn't 'repede' more like 'quickly' than 'fast'? According to gGoogle Translate.... I know G.T's not always accurate but that seems to make sense....
Don't hotari and decide mean the same? according to the dictionary they do! I checked again and I wrote repede which I think is interchangeable with rapid or not?