You can also tag a tennis court as
leisure=pitch
sport=tennis

see: leisure=pitch
(instead of landuse=recreation_ground which is a more general tag, see: landuse=recreation_ground )

Thanks for helping improve OSM! I noticed that some of your building traces don't have 90 degree corners. Please see this segment of a short video about using the functions in iD editor to learn how to quickly improve this:
https://www.youtube.com/watch?v=E1YJV6I_rhY&t=73s

and for 5th street NW, your addition is a duplicate as the cycleway is tagged to the road, see way/6059154#map=17/38.92500/-77.01935&layers=C

it seems you've added a cycleway along Howard University's boundary. this includes along Georgia Ave (where there is no bike lane infrastructure), and just north of the DC Water buildings where there is no public access.

hi Erika, please make sure you square your buildings and tag them with "building=yes"
please watch this video for a refresher
https://www.youtube.com/watch?v=lSLe6rjtgi0

Please do not add fake data to the map. This is destructive and harmful.

Please do not add fake data to the map. This is destructive and harmful.

you mapped what looks like a park as a graveyard. do you have local knowledge of that feature?

please make sure you trace individual buildings and square your features when needed

You have traced a lot of agricultural fields as buildings.

Please trace individual buildings and not just a large blob over a cluster of buildings.

please square your buildings and align the footprint as closely as possible to the feature visible in the satellite imagery.

there is no building here. just agricultural fields.

These are agricultural fields, not buildings. Please be careful when you are mapping.

You have traced agricultural fields and tagged them as buildings.

Please make sure to trace individual buildings. You have traced random shapes over farmland and tagged as buildings. This is completely wrong.

This is the wrong use of the "name" field. For proper use of "name" please read: name=*

These are not huts. And this is the wrong use of the "name" field. For proper use of "name" please read: name=*

you traced a large area of agricultural land and tagged it as a building. please be more careful in your mapping.

all of the "buildings" you mapped are agricultural fields, not structures.