Tracking trades at the ASK versus the BID is one very basic method of ascertaining the general trend of the emotions of shareholders and buyers.
Generally, shareholders determine the trend of trading each day. If they are unwilling to sell and only buy, the price will rise. (This is an ideal, shorts and MM's who own no shares will always attempt to influence shareholders buy creating a false selling narrative)
If a large percent of transactions occur at the BID, it tends to mean shareholders are willing to part with their shares quickly because they feel the share price is headed downward.
Conversely, if shareholders are confident the share price will hold or go upward, they are more willing to wait for someone to buy at the ASK
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