Dual Language E-Books From Frendees are the best way to improve reading comprehension in your target language. I tried using a dictionary to look up words I didn’t know, as well as tried buying the same book in two languages, but both of those methods were tiresome and bulky. Frendees solves the problem by letting you change between two different translations as you read. Check it out if reading is your preferred learning method, they come in spanish, german, and french so far.
Dual Language Reading