Imagine that you want to (or as homework have to ) watch a video with tips on how to reduce your intake of sugar.
The first thing you should do is to activate your (hopefully) already existing knowledge about this topic. Imagine that you tell a friend / your teacher etc. what you already know, if possible you should speak loud: „First of all you should avoid or at least reduce sugary drinks. One litre of normal coke enthält …“ Already at this stage you should look up unknown words first at PONS and then check them at either the LDOCE or the OALD. You continue like this and try to speak for ca. four minutes: „Secondly you must pay attention to all the hidden sugar. …“
Now start the video. You should stop the video (with the spacebar Leertaste) whenever a new aspect has been dealt with and repeat in your own words what has been said. If there are again important words you don’t know / remember, look them up.
Your vocab work becomes much more efficient if you don’t only look up words but note them down or save them for future revision. One possibility is of course to write down the English word and its German meaning on a piece of paper, but you can of course also save it digitally e.g. at Quizlet.
You should also save the video for future revision. At YouTube you can use Speichern / Später ansehen or you use a service like Pocket.
At the end of the video you should again revise what you have seen / learnt. Again you should speak loud if possible.
Now practise my tips with the following video: