I learned English as a child, in school. We started at age 9 (a little bit too late). When I grew up, there was no Internet and only a few TV channels. I taped two strips of paper over the subtitles, directly onto the glass of the telly, effectively blurring the subtitles much to the annoyance of my parents I might add. English and American TV serials were broadcast with subtitles in my mother tongue, never dubbed. I also recorded the soundtrack of my favorite films, and at the time Startrek was a big thing (with William Shatner). Video was not yet widespread or even invented in fact, so I only got hold of the soundtrack, which I played on a cassette deck. I guess I liked the moral of the story of the Startrek episodes (there is always one). Nowadays I practice by taking free online classes called MOOCs at EdX or Coursera, or regularly reading newspapers online.

Hi Sara, I practice watching movies with subtitles written in english, also I listen to podcasts frequently. When I don't know the meaning of a word or expression, I just search for its meaning. 

Downlode an app called voa learning english ,and listen to the video,it is quite helpful because it improve my pronunciation and listening.

To me, also than movies and such things, reading aloud gives a big hand. It improves your pronunciation and gets you familiarized with the tongue you're learning on.