How to be a good girlfriend or partner?

I don't have much experience with relationship since I'm busy with my life and work. I want to know what is the best to maintain healthy relationship and what are the things that consider as toxic relationship. I also want to know what are the toxic girlfriend and what are the things to be considered as good girlfriend especially if i want this to be a long term relationship. Feel free to say something that's all thank you.
How to be a good girlfriend or partner?
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