Model :

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ISP :

TP-Link Model TL-WR74ON
Due to recent security problems, I want to make sure my router is secure. Here are questions I have:

DDNS service not launching
Current statistics disabled
Where is guest network on my router-shouldn't it be disabled ?
What to enable in DH CP settings
Clients list-'unknown'

I do not understand much of this ; not sure what must be disabled/enabled in each category of settings.
Thank you for assistance !