To know the procedure to brew the potions in the game, do the following steps given below,
Start by making a brewing stand by arranging the ingredients in the following way in a crafting table (you can get one from a village church and mining it with a pickaxe as of 1.14 and get one from an End Ship
In addition to the brewing stand, in their respective slots (shown below), a player will need blaze powder and 1-3 glass bottles (crafted with 3 glasses) along with a water source to fill the bottles with (a water source block or a cauldron).
By right-clicking on a source of water when holding the bottles, fill the glass bottles with water. They will begin brewing once a player has finished filling the bottles.
In the brewing stand, placed 1-3 water bottles and 1 blaze powder and then place the first base ingredient (usually Nether Wart) in the top slot. If they use the nether wart, a player should have an Unpleasant Potion when it finishes brewing.
They can place other ingredients in the top slot to make many different potions until a player has an uncomfortable potion.