I'm setting up GL-MT6000 wireguard server Global options I enabled cascading & DDNS Do I still need to open ports in the GL router or dos it do it automatically? I connect the Client from outside house on 5g phone.
Hi,
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If the VPN client did not enable on Flint 2, there is no need to turn on cascade. DDNS enabled is ok.
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There is no need to configure port forwarding on Flint 2. However if there is a primary router, it is necessary to open port forwarding on the primary router.
Please refer to the following guide:
Thanks Bruce, but it was my stupid mistakes. When I generated a Client Profile, I forgot to Click DDNS 
Anyways, What is Client to Client? I setup Flient 2 Wireguard server for home & taking Brume 2 Wireguard Client overseas 
Any Tips or tricks to make them connect faster speed? This Guy on YouTube 
helpful https://www.youtube.com/watch?v=hKqTycmp0Rk
Not possible mostly. It depends on both sides internet connection.
I only enabled Adguard Home but IF I Enable Adguard home handle clients request will it mess up my working server client I just fixed? 
If I enable Client VPN on flint 2 for home, will it disable the VPN server?
No.
You can even cascade them: How to use VPN Cascading on GL.iNet routers - GL.iNet Router Docs 4