Understanding the basic concept is the most important step of mastering physics. For that: 1) Find a good teacher. (Extremely important) 2) Don't be afraid of physics.Read it regularly.The more you read it, the better you get at it.( Very important) 3)Read from any source you are comfortable with- A) any standard textbook (NCERT or any other book) OR B) study material (Preferably Aakash or FIITJEE) OR C) Class notes 4) Refer online videos: A) Khan Academy[ https://www.khanacademy.org/science/physics] B)Pradeep Kshetrapal's lectures on YouTube[ https://www.youtube.com/user/PradeepKshetrapal] C) You will get lectures of all topic on YouTube,just search.