I want to capture 802.11 packets and monitor 802.11 Access points, so how can i Capture this packets?

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It's not easy. On Windows you can use an old Microsoft program called Microsoft network monitor. cellstream article You can save the file and open in wireshark. You need a wifi adapter that supports monitor mode - some do not, or not under Windows anyway. If your wifi traffic is encrypted I recommend you turn off encryption - make it an open network, while you capture messages. Otherwise, for Linux see this -- and this

https://wiki.wireshark.org/HowToDecrypt802.11

https://ask.wireshark.org/question/3856/invalid-key-entry-in-wpa-pskwpa-pwd/

You could also try commview for wifi

https://www.tamos.com/download/main/ca.php

or

https://www.acrylicwifi.com/en/wlan-wifi-wireless-network-software-tools/wifi-analyzer-acrylic-professional/

it's inexpensive but doesn't support decryption and only 802.11abgn. https://www.acrylicwifi.com/en/support-webinars-wifi-wireless-network-software-tools/compatible-hardware/

I would recommend you start here:

https://wiki.wireshark.org/CaptureSetup/WLAN