This is the 652nd most frequent German word.
entwickeln
To develop or evolve.
Here, 'entwickeln' is used in the sense of creating or developing something new, often implying a structured or technical process.
Die Forscher entwickeln eine neue Software.
The researchers are developing new software.
In this sentence, 'entwickeln' is reflexive ('sich entwickeln') and signifies the growth or progression of qualities or abilities over time.
Kinder entwickeln sich oft schnell in den ersten Jahren.
Children often develop quickly in the early years.
'Entwickeln' here denotes the process of forming or bringing into consideration new concepts or thoughts, indicating an abstract or intellectual development.