I agree with @pengeszikra , nothing better for realizing you know what you're talking about than reading your old code. All these things you struggled with only months ago you are now very comfortable in. Helps you realize that you're not dumb or unqualified, you're just new to something. You'll catch on fast, and that's why you are where you are.
Second best thing is working/reading Open Source software. Teaches you that people come from a variety of backgrounds and skillsets. You are likely a pro in something someone else struggles in, and vice versa. And all these people have also experienced the same impostor syndrome as you have.
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I agree with @pengeszikra , nothing better for realizing you know what you're talking about than reading your old code. All these things you struggled with only months ago you are now very comfortable in. Helps you realize that you're not dumb or unqualified, you're just new to something. You'll catch on fast, and that's why you are where you are.
Second best thing is working/reading Open Source software. Teaches you that people come from a variety of backgrounds and skillsets. You are likely a pro in something someone else struggles in, and vice versa. And all these people have also experienced the same impostor syndrome as you have.