Your best friend is going to be a piano. While other instruments have solid fingering charts, the fingerings on a French horn are pretty much just a suggestions. Use the fingerings and match the pitch to a piano key (this requires basic piano skills, sorry). The only way to learn notes on horn is to do this over and over and just learn how a note feels when you play it.
| Note on French horn | Note on Piano |
| C | F |
| D | G |
| E | A |
| F | Bb |
| G | C |
| A | D |
| B | E |