When I was assembling my bike, Birdy, the chain got tangled. I managed to untangle the chain. After untangling the chain, the derailleur could not work well. The gears wouldn’t change well.
I’ll have to go to a bicycle store and have the derailleur repaired.
I noticed that the bike’s chain was dirty, so I’ll be buying the detergent and oil for the bike chains.
After coming home, I went to wash my hands. Despite that, my fingernail remains dirty.