Hello new jumper.
First, based on my knowledge without looking up what that link actually is - I think bg5 is not beginner maps, it is beginnings maps (big difference). 6 or 7 maps designed for a speed jumping competition that occurs about every year. Most of those maps aren't actually easy to complete.
Next, for jumping tutorials, I don't think they are that useful except if you are completely starting from scratch (which you are it seems)
The 2 Natefox videos will give you the basics that you can expect from online tutorials
From my experience the best way to learn jumping is to first know exactly what you need to do by watching someone else play, then spend hours of practice to finally develop that skill yourself. This happens quite naturally if you join the many still populated jump servers around the world. The biggest and most developed jumping community is located on the Tempus severs where you will find brand new jumpers, up to the very best in the entire world
https://tempus.xyzMost people here will be very helpful and you can tell their overall skill level based on their public jumping rank.
But if you have no desire to get to know the community then I suggest going on some of the easiest maps and grinding it out by yourself. Jump_academy, jump_beef, jump_rush, jump_beyond and jump_freezeflame are some of the basic easy maps I suggest to download and play first.
Finally, outside of the Tempus servers there are other jumping communities that have a very useful feature for learning. It is a jump bot that you can spectate instead of watching other experienced jumpers. I personally used this bot to learn from before I joined Tempus.