It's important to note that hacking and pentesting should always be done legally and ethically, with proper permission and within the confines of the law. That being said, here are some recommendations for a laptop that can run Kali Linux and help you learn more about internet security and pentesting:
Dell Inspiron 15 5000 - This laptop has a 15.6" screen, an i5 processor, 8GB RAM, and a 1TB HDD. It also has a built-in wireless card that should work with Kali Linux.
Lenovo IdeaPad 5 - This laptop also meets your specifications, with a 15.6" screen, an i5 processor, 8GB RAM, and a 1TB HDD. It also has a built-in wireless card that should work with Kali Linux.
When it comes to wireless cards, some models that are compatible with Kali Linux include the Alfa AWUS036NHA, TP-Link TL-WN722N, and AWUS036ACH. However, as you mentioned, you may not need an external wireless card if the built-in one in the laptop you choose works well with Kali Linux.
In addition to the laptop, you may want to consider purchasing some additional resources such as books or online courses to help you learn more about internet security and pentesting. It's important to approach this field with a strong ethical foundation and to always use your skills for legal and responsible purposes.
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