The Fridrich method is an advanced cube solving method used by the speedcubers today. Very fast times can be achieved with motivation and practice. Jessica Fridrich is the person who made this method. It is not the best method for speed cubing, solving a Rubik’s cube as fast as you can. Other methods also have lots of potential but I chose and stuck with the Fridrich method. Be warned people don’t expect to be solving a Rubik’s cube as fast as 13 seconds in one day. It is not going to happen. To be able to solve a Rubik’s cube that quickly you need two things: know an advanced solving method and be able to execute it fast.
Make the cross- Just like the beginner method you make the cross. However, where you make the cross changes. You should start making the cross on the bottom or on the left. I personally make it on the bottom so I have better over view of the corners and the edges. Just knock out your habit of solving the cross on the top. Doing it on the bottom or left , will significantly decrease your times by more than 5 seconds. Last thing, when you make the cross try to make it in 7 or 8 moves.
F2L- An important step for the Fridrich method that if done correctly can decrease your times by 20 or more seconds. Remember in the beginner method you are used to putting in the corners on the top layer and the then the middle layer edges? Well, you lose a lot of time doing that. So what you do is you pair up a corner with its corresponding edge. This takes 3 or 4 moves to do. Here is an example- blue is your front side. Yellow is on the top, The 2 pieces that will be solved are the blue-white-red corner and the blue and red edge. The corner is on the top-right- front spot and the edge is on the top-back. The corner has white on the right hand side and the edge on the top- back layer has blue facing up. Now we can connect them, to connect them you do an R. Now turn your cube around to the green side with yellow on top. If you look closely, you see the red part on the edge matches the red part of the corner. Same goes with the blue facing up. Turn back to where blue is on the front and the yellow is on the top. Do a U and R'. Boom. One slot- corner edge pair is solved (The bottom-front right in this case). Do you get the idea? Hopefully, you do. Just run a quick google check on F2L and you will find tons of sites explaining the concept of F2l. I encourage you to don't learn all the algorithms, but just get the idea and mess with your cube.
OLL- this step comes after F2L. There is nothing in this step except learning 57 algorithms for 57 cases. What the algos do is they orient the entire layer in one algorithm. Learn few of them at a time, and execute them fast. Type in google , OLL and sites will come up giving you all the algorithms. I myself only know 85% of these.
PLL- The last and final step. In this step all you do is memorize 21 algorithms and execute them by finding the case. Nothing else to it. I know about 95% of these. Find the lists of algos and use the ones that you prefer.