On Candy Crush, each level is unique and that is why the game is so much fun. However, there are things that you can do in order to pass most levels. There are tips below.
When starting a new level, take a careful look at the board before you begin. It is easy to waste a few lives by starting to play without really planning a strategy on winning. Firstly, find out the aim of the level which could be to remove all of the jelly, get a certain score, beat the clock to get a certain score, bring ingredients down to the bottom or to collect all orders. Look out for trapped candies, chocolate and chocolate makers, hidden jellies, bombs and things like that. If you have to get ingredients down, find out where the exits are. Check for portals and note the shape of the board and how many different colored candies there are.
If you are a timer, you just need to get going, make as many special candies as you can and just work quickly, spotting the candies that have extra time bonuses and getting as many of those as you can. However, most levels do not have a time limit and it is wise to take your time. Scan the board after every move to look for the best move. You will be more likely to see opportunities to make special candies this way. Do not expect to crack a level first time though. It may take several attempts before you get to grips with the best tactics to solve the level and then you may need to play several times in order to get the right combinations of candies to do it. Remember, the candies are randomly generated which means that it is not always possible to win each game. This means that you will need patience. Do not use any boosters until you have played the level several times if not more because you will need to be sure that they are necessary and that they will help you. You do not want to waste them on levels that can be solved in a couple of tries anyway. Remember, just because a level has a higher number, it does not mean that it is necessarily harder. Some of the hardest levels are lower numbered ones.
If you are having trouble getting to grips with a level and not knowing what you need to do in order to win it then take a look at a level walkthrough. There are videos showing other people solving the levels. Sometimes you can pick up a great tip on what you will need to do in order to pass it. Other times you will see that the player has been very lucky with the candies that they have been given and you will just know that you will have to be patient. There is a psychological advantage to watching someone win the level too. Your brain will know that the level can be done and it will increase your confidence and determination that you can do it now that you know that it can be done. You may also be able to find written tips or comments from other players that have solved it and have helpful advice. If you are finding a level hard then other people will be as well and so asking them for help could be good. If you have friends who play that are on higher levels than you, then ask them how they did that level as well.