Hello, those tips are excellent yes. Here is another one which you can add.
If you can't afford focus slashes which are quite expensive 2k/each is still quite high for beginners. You can take: a false sweeper + flash or any other accuracy reducing move.(mine is sceptile)
Now, false swipe then the opp is 1h then, when you are close to dying, just spam flash until he kills you. You can now switch and the chances to be touched are quite low (dragon den is the best place imo)
This technique works best when you have a lot of pokes to lvl up too, since there is a chance to be hit anyways, a back up isn't that bad.