This is a very useful resource for tracking what is going on in the Ukraine war.
Produced by The Institute for Study of War (ISW) it is a daily assessment (see under “Latest”, example here) of the situation on the ground along with a useful map (pictured).
Here is a video that time lapses all the maps since the invasion began.
This Substack (written by Lawrence Freedman, Emeritus Professor of War Studies at King’s College) provides some very good analysis of the meta situation.
One angle that is key to watch for second order thinking is China. This was a really great piece to understand the China angle as was this (arguing that perhaps this crisis could push China back to collective leadership).