Learning the rules + practice and speak + listening and viewing of videos

It's mostly practice. If you are at the beginning of learning English, try to find some basic lessons on the internet, or use an English learning book. To build up vocabulary, try and think what the most important things words are in a basic conversation. If you want to talk about your family, learn words like 'father', 'mother, 'sister', 'brother'... The most important verbs to learn the conjugations in present tense: 'to have', 'to be', 'to want', 'to live', 'to speak', 'to see'... Start learning words about one subject and try and find someone you can practice this subject with. Because with languages, it's practise, practise, practise. :) There are a lot of English teachers here who teach Beginners, you could try out some lessons, too. I wish you all the best!