Please capitalize where necessary: a 15-minute walk through the westerpark will get you to the heart of the city.
A: A 15-minute walk through the Westerpark will get you to the heart of the city.

Please capitalize where necessary: for decades and centuries archaeologists, historians and others interested in the monuments in jelling have debated whether or not there was a royal dwelling or fortress connected to the jelling monuments.
A: For decades and centuries archaeologists, historians and others interested in the monuments in Jelling have debated whether or not there was a royal dwelling or fortress connected to the Jelling monuments.

Please capitalize where necessary: netsh ras aaaa show authentication: displays the current authentication provider.
A: netsh ras aaaa show authentication: Displays the current authentication provider.

Please capitalize where necessary: on the shelfs on the north side, the gannets breed.
A:
On the shelfs on the North side, the gannets breed.