Reddit mentions of Training and Fighting Skills

It's almost impossible to teach yourself any martial arts style unless you already have a high baseline of athleticism or already have some training in a combat sport or martial art. Without observation and feedback from an expert, you're at a very high risk of developing poor habits and potentially injuring yourself long-term. I'm sure you know that already, though. If you must practice by yourself, here are some tips:

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1. Film yourself from every angle and compare it with what you see in the videos. If you can find a mirror, use that, too.
   
2. Like other commenters have suggested, combat sports such as boxing and wrestling are "martial arts," too, and extremely useful for self-defense and general fitness. Try to find a club or instructor nearby for those.
   
3. Work on basic fitness, including strength, endurance, and flexibility. Lift weights, do some cardio (calisthenics, jogging, cycling, etc.) and stretch at least a little every day.
   
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   Here are some of my favorite resources. Note that I use these to supplement my training because I am a karate black belt with over a decade of experience; I really don't think beginners can teach themselves from videos or books. Proceed very slowly and with caution. If and when you do get formal instruction, be prepared to unlearn a lot of bad habits you may have accidentally acquired.
   
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   Here are my favorite martial arts YouTube channels:
   
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4. Fight Tips – MMA instruction by Shane Fazen https://www.youtube.com/user/FightTipsVideos
   
5. Kwonkicker – Taekwondo and Muay Thai instruction by Micah Brock https://www.youtube.com/user/kwonkicker
   
6. Ando Mierzwa – Kung Fu and general martial arts instruction by Andrew Mierzwa https://www.youtube.com/user/AndoMierzwa
   
7. Ginger Ninja Trickster – Taekwondo and kickboxing instruction by Aaron Gasser https://www.youtube.com/user/GingerNinjaTrickster
   
8. ATHLEAN-X – Strength training and general fitness by Jeff Cavaliere https://www.youtube.com/user/JDCav24
   
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   My favorite books:
   
   
9. Stretching Scientifically – If you want to develop high kicks and good overall flexibility, you need this. A guide to stretching by Thomas Kurz https://www.amazon.com/Stretching-Scientifically-Guide-Flexibility-Training/dp/0940149451
   
10. Championship Fighting – A handy guide to boxing by world heavyweight champion Jack Dempsey https://www.amazon.com/gp/product/1501111485
    
11. Training and Fighting Skills – An introduction to kickboxing by undefeated champion kickboxer Benny Urquidez https://www.amazon.com/Training-Fighting-Skills-Benny-Urquidez/dp/0865680159/