In the first sentence it should be 'the words that confused me' or 'the confusing words' (closer to what you wrote), and the last sentence 'what I do takes time and effort and sometimes I think I can't stand it for long (or for a long time/for much longer). The reason is 's' makes it plural 'efforts' suggest you put more than 1 effort into it, but the correct way is 'it takes a lot of effort' or the opposite 'it takes no effort'. As for the answer what you do is sure to help become fluent in the language (although it is boring, very boring) but regardless, checking the definition of words you don't understand is a good thing, then you have to show understanding by putting the knowledge to use (making a sentence using that word). I don't really know a better method but to make it more fun you could try and associate the word with something funny (creating a link to another thing like a funny picture). Best way is to speak to people.