More can be said if anyone has anything to add, but in the meantime I’m gonna steal an old compilation of older answers you may enjoy:

• How was the Torah used to help revive Hebrew? Wasn’t it extinct in the first place? How would they know pronunciation? by /u/hannahstohelit
• In the lead up to and when Israel became a nation, how did people develop an effective social and political state when everyone spoke a different language; or was modern Hebrew already spoken by the majority? by /u/ghostofherzl and /u/gingerkid1234