Streetknights

 This genre was invented by thejonymyster. The first four puzzles in this post were made on the nineteenth; the last one was made today.

Rules: Shade some cells in the grid. Shaded cells cannot be orthogonally adjacent. All unshaded cells must form one orthogonally connected region. No 2x2 section may be left entirely unshaded. All shaded cells must form one connected network via knight moves.