Why is there a drip after I replaced toilet innards?
The toilet connections shown depend on rubber gaskets to make seals. These seals likely need replacement. In addition, I see that PTFE (white colored) tape was used. It should not be used for these fittings (or any compression or flare fittings), and can cause leaks.

Disassemble the connections. The top leak is likely caused by the washer (inside the toilet tank) not being seated correctly. The gasket should have come with the replacement fill valve. The tank should be cleaned at the location where the gasket sits. I can't tell for sure, but the nut holding the valve onto the tank looks a little bit undersized. It should completely cover the hole in the tank.

The metal flare tube also needs a washer in order to mate with the fill valve. This washer should be replaced. I would tighten it hand-tight plus 1/4-1/2 turns. In addition, the nut should be cleaned of the debris visible in the photograph.



Another reason could be that the tank was cracked. Sometimes, hairline cracks are very difficult to see, but are able to produce leaks.