How do charts work now?

My brain gets fried every time i try to understand charts, especially the new melon rules

Most charts use streams and downloads (60/40), but nowadays downloads are that low in korea that they barely have any impact. The only chart where downloads are important is Bugs (they have a really small market share anyway), all the rest you can consider them basically 99% streams. Also I think Flo is just streams.

Then now we have Youtube in Instiz which is obviously the views of the videos.

Melon top 100 - 50% stream 50% uls(before chart freeze), 100% uls(after chart freeze)

I think most other real-time chart is stream and daily is based on uls.

and then we have bugs = download.

YouTube is based on how much the song played

Music Charts and Insights - YouTube Help (google.com)

The Top Songs chart highlights the number of views of a song on YouTube. It’s calculated by combining each official versions of a song including:

• The official music video
• User-made videos with the official song
• Lyric videos

The Top Songs chart is updated weekly.