How to get a list of most fragmented tables in Oracle?

Is there an SQL on how to get a list of most fragmented tables in Oracle DBMS?

Thanks! I would just like to ask you, what do the negative values mean in wasted space?
Is there an easy way to improve defragmentation state?
TABLE NAME     SIZE     ACTUAL DATA     WASTER SPACE
TREE     0     0     0
GC_S     3744     4651.9     -907.9
TRAIL     104     113.04     -9.04
ASSOCIATION_RULES     272     353     -81
ATTRIBUTES     1728     2528.12     -800.12
AUDITACTION     128     208.48     -80.48
DV     18608     36266.47     -17658.47
S134     728     903.08     -175.08
A178     344     518.75     -174.75
S129     728     896.48     -168.48
AGS_NODES     2864     4510.33     -1646.33
S149     472     633.79     -161.79
S127     728     871.62     -143.62
tu     2232     3619.76     -1387.76
PCd_DATA     3112     4371.75     -1259.75

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