3. There is no reason for a tutorial for OpenVPN. If you just go in and enable it, hit apply, and export the OpenVPN file (and then import it to the device you want) it just works.
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Okay, you're talking about a paid-for VPN service, not an OpenVPN connection back to your home when you're out and about.
I don't use nor recommend those services at all. Someone else will need to help with that.
Try to set " Username / Password Auth. Only " to NO, you use both password and certificate
Seems you use a very old FW, which one and router model?
With the links above, that you show, i was happy to configure the router for the first time, so far so good.
However amout of parameters which is still unsolved is big.
Since these are specific settings of the router, I have summarized the events below.
Router specification
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Model: RT-AX88U
Firmware version: 384.19
Firmware build: Fri Aug 14 19:20:07 UTC 2020 merlin@9a4e0c6
The firmware is up to date.
Alternative firmware for Asus wireless routers
sourceforge.net
VPN specification
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I have NordVPN - which is a paid VPN service.
Instructions on how to set it up properly would be appreciated.
However, You said you were using FREE OpenVPN,
if so, which FREE service would you use, and if so, I bet you already have instructions on how to configure it.
Which one is that?
Which VPN service on OpenVPMyou recommend to use?
VPN configuration
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In this menu I can do the following
There will be 2 wifi networks
internal : 5 GHz
external/guest : 2.4 Ghz
Configuration
CLIENT-CONTROL:
fill in the description
upload the file
set service status: ON
automatic when posting : yes
AUTHENTICATION SETTINGS:
Fill in user name
enter password
directly below it says : warning : "You need to define a certification authority". So what should I do?
" Username / Password Auth. Only " : NO,
The rest is beyond my understanding. I ask for guidance
3. regarding VPN settings: should I change something there?
4. here are also attached settings of WIFI 2.4 GHz and WIFI 5GHz [attachment #2][attachment #3].
Regarding the WIFI settings: should I change anything there?
5.Is there any single book/publication/cert,
where I could learn about these things?
Thanks a lot!