Engine cylinder not firing?

There are a number of things that can cause this. First and foremost is the spark plug so we need to remove it and see what it looks like. Can you get a picture of it and let us know if it is fouled? Below is a chart that will help with this.

Here is a guide that will help with a misfire as well:

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

Please run through this and we can go from there.