personal
The German word 'persönlich' is used in a similar way to the English word 'personal'. It can refer to something that is specific to an individual, such as personal belongings or personal information. It can also be used to describe someone's character or behavior, as in 'persönlich' (personally) responsible for something. In a business context, 'persönlich' can be used to describe a personal meeting or appointment, as opposed to a professional or formal one.
I take it personally.
This phrase is used by someone who is expressing that they feel personally affected by something, usually in a negative way.
That is my personal opinion.
In this context, the speaker uses 'persönlich' to indicate that the opinion being expressed is their own, not a generally accepted or objective truth.
We have met in person.
This phrase describes a physical, in-person meet-up, as opposed to a digital or remote one, using 'persönlich' to emphasize the personal, face-to-face nature of the encounter.