1.By reading.

2.Writing down the new vocabulary as " phrases".

3.Connect the new vocabulary to its meaning by having a picture or a well-known example of it in my mind , and trying to avoid connecting it to its translation in my mother tongue.

4.By practice them " Use it, or you will lose it! "

Hope to be of some help :)

i think speakig can help us to learn usefull words for us ..when you talk to the others and you force yourself to speak...so you need enough words to continue. then you will have many words on your mind but not in english (in your own language).then you will try to find the same meanings for them in english.i think it will be really useful .

It is useless (well, almost) to learn words without context.  You should learn phrases instead. I like a phrase:"Don't study language. Use it." Do what you like. I like reading, so it is very useful. And text chats. After 2 hrs of chatting the language barrier disappiers. I'm lucky to have friendly partners in every language I'm learning.

I'm reading a lot.

Read English book can improve your English.