What should you remember when converting an image to a WebP image?

Is there a possibility that the WebP conversion can cause an increase in the file size?

1. Do not use lossy compression when converting a GIF or PNG image which contains only a small number of colors. Use lossless compression instead to avoid an increase in the file size.
2. Do not use lossless compression when converting a JPG image. Use lossy compression instead.
3. Do not set the quality value too high when converting a JPG image. Try lowering the value if the file size of the WebP result is bigger than that of the original image.