Guidelines for pairing fonts:

1. Pair a Serif with a San Serif or vice versa

2. Generally avoid pairing two Serifs or two San Serifs—as they are two similar

3. You only need two fonts, avoid having too many font types

4. Pay attention to priority — which font is going to be used for headlines vs body text

5. Keep body text fonts that are best used for readability

6. Unify the different fonts using the same color or contrast if needed

7. Avoid anything too similar & make sure each font has enough families (light, bold, etc) to allow for good hierarchy between each font type—unless you're planning on using a "themed font" for strong personality to use for large headlines.

See below: