How to separate guest wifi

I have linksys EA3500 and want to flash openwrt. I want 3 vlans LAN, Home wifi users(5Ghz), Guest wifi users(2.4ghz). How should I achieve this? Please help.

https://openwrt.org/docs/guide-user/network/wifi/guestwifi/guest-wlan-webinterface is a good starting point.

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