How the coffee is prepared depends entirely on the product you have chosen. If you use a Chemex or a hand filter, for example, you prepare your coffee using the pour-over method. This means that you place a suitable paper filter in your maker and fill it with freshly ground coffee powder. This is then poured over with hot water and the coffee begins to drip into your collecting vessel, for example a cup or a coffee pot.
If, however, you use a French press, you don't need a coffee filter. With this method of preparation, you fill the ground coffee beans directly into the pot and pour hot water over them. After a short rest period, you place the sieve attachment, also called a plunger, on the pot and slowly press it down so that the coffee powder is pressed towards the bottom. Therefore, you should grind your coffee medium to coarsely with this brewing method.
The AeroPress, on the other hand, works similarly to a French Press, but requires a paper coffee filter. The coffee-water mixture is filtered through this at the end of the brewing process.