Always apply the buying low and selling high.
You can't just say easily to apply buy low sell high in trades. It's easier said than done. You can't just determined that a certain price is the buying rate or selling rate. Plus the factor also that different coins have different price behaviour. What people should do is to have a regular checking of a certain's coin volume in order to have a wild analyzation that a certain price
"can be consider" as buying or selling rate.
Patience does matter. Building trading experienced is the key.
I supported what you said in terms of building trading experience because the crypto market always drift and the analysis which work perfect last year might be useless this year and crypto market is far than buying low selling high because this was the exact thing most newbies trade believed which lead to their losses.