Difference between high german and low German phrases?
A question I often get asked is ‘why do some courses teach ‘different’ German phrases, then other. The simplest answer for this is, some teach High German phrases and others teach Low German phrase (the bad ones).
Low German is an older version. There was a vowel change in 7th/8th century and they did not include it. Sounds like Dutch. High German is prettier and sounds more Bavarian and of course they made the changes along the way. The dialects are spoken in different geographic areas (low mostly Northern coastal) and interestingly, speakers of each language may not understand the other at all. High German is also found in France. Neither are considered standard German
If you are planning of learning German, DO NOT learn Low or High German phrases as they are both ‘old German’ (think Shakespeare English). Make sure that you focus on and learning standard German phrases, and you will be well on your way to learning German phrases, that are understood everywhere. The videos and learn German phrases on this site are all in standard spoken German of course 
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Good luck and I hope you are enjoying the wonderful German language.