language improvement for daily life

HAVE YOU EVER THOUGHT '' HOW CAN WE DEVELOP OUR SECOND LANGUAGE? I believe that there are a lot of ways to develop our second language , but first of all we should decide which part is most important for us ; speaking, writing, listening, reading , grammar... etc. I think speaking is the most important part for daily life, but we need to be good reader , good listener, good writer to be good speaker.I am sure that everybody is good at grammar because we studied a lot at the high school. However, we could not develop  our other  skills.When we speak English , we do not have to be careful about grammar. WE just focus on what we want tell people . Another important thing is always should listen a native speakers. Who knows maybe one day we can become like a native speaker :)