Well, one thing to know for you to know is that you can use Oryx. Through Oryx, I found out that Russia was finally able to destroy one HIMARS, but that is just one HIMARS destroyed out of the close to 60 Russia claimed to have destroyed. Also, you can't know for sure which side is propaganda. To see if it is propaganda, you have to make sure if the statement or other thing makes sense. For example, if TASS states Ukraine lost 444000 troops, that is possible propaganda. I don't know what timescale, but I do believe it is in a day. Generally, I would ask you to also use Reuters. According to mediabiasfactcheck, they are least biased and have very high factuality. And yes, also use fact checkers.