Okay kiddo, so French orthography is just a fancy way of saying how we write and spell things in French. It's kind of like having a special code that we use to write down our language.
Now, French is a pretty tricky language because there are a lot of rules for spelling and pronouncing words. For example, sometimes we put two letters together to make them sound different than they normally would. Like "oe" in "oeuf" which means egg in English.
Another important thing to remember is that French has a lot of silent letters. That means we write them down in a word, but we don't actually say them. For example, in the word "deux" which means two in English, we write the "x" at the end but we don't say it.
It's also important to know about accents in French. We have three different accents that we use to change the sound of certain letters. The "é" accent makes the "e" sound different, like in the word "café" which means coffee in English. The "è" accent also changes the sound of the "e", like in the word "père" which means father in English. And finally, the "ê" accent makes the "e" sound even more different, like in the word "forêt" which means forest in English.
Overall, French orthography is just a set of rules we use to spell and pronounce words in French. It can be a bit tricky at times, but with practice, we can learn how to write and speak this beautiful language with ease!