how to efficiently take notes while watching anime?

Basically, I feel like デュオリンゴ isn’t enough, so I wanted to try and watch アニメ to practice my 日本語 and I thought about taking notes, where I write the term in ひらがな/カタカナ/漢字 but I know that it will take a lot of time, so I wanted to ask about how to do it efficiently. When should I stop to take a note? How often? If anyone has solution, it would really help me and I would appreciate it.