TWDsje 

OBS is by far the most popular tool for this sort of thing. There's hundreds of tutorials on how to use it on YouTube. Make sure you use the encoder on your videocard. Also play around with the bitrate. You typically don't need as high of a bitrate because there's not a lot of movement in trading videos. That will make your videos smaller.

Yeah,you are right,OBS works for everyone.

What bitrate do you recommend starting with? Sorry for the noob question but I have never used anything to record my screens in the past so this is all new to me

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OBS does do a good job.