This whole forum contains lots of information about lots of practices to become lucid. I guess you’re new to the subject, so first thing you absolutely need is a good dream recall. Some might argue this, but if you can’t remember your dreams, how then would you know you’ve had a lucid dream? I’d say you should at least remember one dream a night. The BIG Remembering Dreams Topic part 2 can be found here (there’s always a link in the first post of that topic, referring to previous parts): https://community.ld4all.com/t/the-big-remembering-dreams-topic-part-ii/9233
Next, you should start with basic LD induction techniques, such as doing reality checks, WBTB and MILD. Here are the BIG Topics about these practices:
Reality checks (part 2): https://community.ld4all.com/t/the-big-reality-check-topic-part-ii/7108
WBTB (part 2): https://community.ld4all.com/t/the-big-wbtb-topic-part-ii/10649
MILD (part 2): https://community.ld4all.com/t/the-big-mild-topic-part-ii/8731
Also check the Newbie Advice Topic, with helpful hints (part 2): https://community.ld4all.com/t/newbie-advice-helpful-hints-for-aspiring-lucid-dreamers-ii/8846
Browse the forum a little and if you need specific information about a specific technique, you could also use the “search” function (all above). Ofcourse you could also ask us if you have a question 
Good luck 