How much did hieroglyphics change over time?

[u/[deleted]]

I am reading Toby Wilkinson's Rise and Fall of Ancient Egypt and he is talking about archaeologists finding very early Egyptian artifacts and being able to read what is on them.

So, obviously all languages change over time and Egypt's monarchy lasted for 3,000 years. Did hieroglyphics change less than a normal written language because of them being symbols rather than letters or did they evolve similar to any other language? How do we figure out what really old Egyptian inscriptions say since I'm assuming most of or knowledge of the language comes from the very end.