You have plenty of options to choose from when you want to reduce the noise in your images. However, you first need to understand why noise actually occurs. How does it get there? Well, the answer to that question is: signal-to-noise ratio. Broadly speaking, the more you amplify the signal, the more noise you get. In order to avoid noise you need to provide more signal and less amplification. When we put that into photography terms, it means you need to expose better and use lower ISO, having in mind that exposure itself is the signal, and ISO is the amplifier of the signal. That is why you get more noise when you increase the ISO.
Photo by Toffee Maky