Regular players can't break or place blocks on my server only when they're oped, people with all permissions (*) can't break blocks either.
Usually, your server can have a protected zone that lasts a certain radius of blocks. Look for the 'spawn-protection' line in your configuration and change it to 0.
#Minecraft server properties
#Fri Apr 03 13:07:30 UTC 2020
Hope that helps.
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