Because the browser will search through them according to the rules of the cascade, it's best to state your preferred formats, like WOFF2, at the beginning.

Multiple declarations can be listed, separated by commas. The latter part in each case is optional, but is useful to declare because it allows browsers to more quickly determine which font they can use. src: These lines specify the paths to the font files to be imported into your CSS (the url part), and the format of each font file (the format part).This can be anything you like as long as you use it consistently throughout your CSS.