What a snake symbolizes in a dream is a power or a power or cunning. Not only that, but it also has a variety of meanings. Therefore, it is difficult to have a nightmare or a good dream just because a snake came out. Let me give you a few examples.
A dream with a small snake next to a big snake: it means that you will seize power and power in the future.
A dream bitten by a big snake: a dream of meeting a spouse or comrade.
A dream of roasting a big snake: a dream of gaining a lot of knowledge.