Keeping on studying English is the only way to improve your English. Never give up and keep studying it.

It depends on your English level, my friend. If you're just a beginner, animated movies and children's songs might be easier for you. Remember that anyone who learns English has to overcome the same problems that you're experiencing. You're not alone and your English is going to be better if you stay motivated.

Remembering more vocabularies, Reading more articles or books and using it frequently. All seems very easy, but, actually, it's hard to do it persistently.

you should begin with the simple video maybe cartoon then you can level up

You can also download the "English listening" application on your mobile phone from BBC & try the 6 minute English program. I love it! I also watch tv series with English subtitles to be used in the language and the pronunciation. At the moment I am watching a British tv show that is called Fresh Meat. And of course another way to practise your English is to take some online English lessons or just chat on Skype. These are what I have done the last 2 months and I feel more confident now.