Even if that large buyer or seller is an arbitrage trade or a hedge?
It's a good question.
Some would consider the motivation of the buyer/seller is reduced to simply offering or taking liquidity.
Anything other than that is speculation of the motivation behind an resting order. The T&S for beginners in orderflow at times is difficult to parse. This difficulty is the advantage of products that reconstruct a tape to show market orders in actuality vs just the colors oscillating on the T&S.
The easiest for a beginner to discern is filtering the T&S to see what price levels larger players shift from offering to taking liquidity. The perception of support and resistance zones can be validated by the activity of larger size.
There are markets orders that are instigated through 'want' and those through 'need'. Want is those that can discern turning points, need is by stop's being triggered and activating market orders.
Depending on the software, the increase/decrease of depth of market limit orders as a histogram on the DOM is informative.
Generally, larger players work with longer timeframes and embark on campaigns to build a position and intraday movements are 'noise' unless that price movement is pushing against the limits of standard deviation.
The part that is mostly unseen, in the re-supply at limit/market on the inside spread.
edit:
Insight is used to expand the limits of what could be termed 'zone of understanding.' At first anything beyond the zone of understanding is noise and not informative. Either through observation and deduction or assimilating knowledge through new material with an open mind can the limits of understanding increase via insight. The zone of understanding increases through this process.
If the insight is close to limits of the zone, than a teaching/learning situation can occur - which paradoxically one in the same. If it's farther away, then it's often met by disbelief and ridicule. If it's farther yet, then anger and hostility arises. The anger comes from a cognitive dissonance that threatens an underlying identity and attachment to an invested perspective/reality.
Your questions have a fundamental doubt of whether orderflow has any informative value. You ultimately get to choose and whatever you do will become true for you.
For a longer timeframe trader, maybe not so much.
However, for an intraday trader it's another tool to master and has a place in the toolbox. Some can use it like a leatherman, others it's just a screwdriver. To others still, this post is a result of having a screw loose.
