Sound proof windows are the best ways to remove the maximum sounds but certainly these are way more expensive and not everyone is able to install these. Even then if you want to reduce the noise in your house and wants to have a more peaceful environment then you could try out these following techniques and these will help you to make your sound proof windows. 

Before you could make your good windows and house sound proof, you should understand the science behind the sound waves. Sound waves can travel from the leak around your doors, chimneys and windows and when these enter your house then these reach your ear by travelling in it. in order to block the sounds, you need to block their passage and their entry points. Therefore, this means that you need to seal off these entry passages and these are usually around the windows which are little gaps and holes. Although, in modern built house this is not much of the issue since the best way to seal the entry for the sound is to simply shut the window. However, you can still check the windows for any possible gaps and there are different sealants available in the market that you could use to seal off these. The most popular ones are the acoustic putty, noise free green sealant and foaming tape which is usually of the high density. 

One way to reduce the sounds is to add more masses between the outside world sounds and your ear and one way to do this is to add the curtains which are very heavy. More the mass, more effective it is against sound blocking since it is able to absorb most of the sound waves. However, many people do not consider these when purchasing the curtains or the blinds but this is certainly an important treatment if you want a peaceful house. The high density curtains and the blinds are not only good for sound proofing but these are very good for blocking maximum light when you do not want to have any light in the house because you may want to sleep peacefully during the day and then these are very good for saving energy  because these act as the extra insulation to your house and stops the heat from going out and the outside heat from coming in and helps in the absorption. This is how you can not only get rid of the unwanted noise and the light but you are also getting rid of the high energy bills. There are even curtains available in the market which are specially designed for these and these are called the sound proofing curtains.