One way to identify a trend is if it is creating HL (higher low), HH (higher high) in an uptrend or creating LL (lower low), LH (lower high) in a downtrend. Another way is simply drawing a trend line.
To identify a market structure shift, there has to be a BOS (break of structure) to the downside or upside.
In market structure shifts, be careful for liquidity grabs; wait for confirmation entry, just be patient and wait!!!