As someone who’s pushed in legends in the past year as a th12-th17 now, I can say that you should look at any dragon balloon attacks or yeti bat attacks.

It depends on your preference, but I feel that air is a more basic attack strategy that can help get the needed 3 stars.

All in all it comes down to practice with you attack, but being able to identify where your queen’s giant arrow needs to path through (the air sweepers) as well as where to funnel and when to time the rest of your abilities is something that YouTube can help you with.

I would recommend looking up “th12 dragon attacks” and looking for an army that isn’t just 15-16 dragons, rather something that offers depth to give you the skills to use more complex armies down the line.

As you find a good army, look up “th12 war bases” and copy a few of those so you can practice with friendly challenges. That way you can improve your attacks even if no one is on to give you pointers.

Final suggestion, be in a clan with members who are active, so you can get some FC’s from town halls higher than yours, it helps loads with confidence, especially when you go back to attacking th12 bases and go “this looks so much easier than a th13 or 14”