youtube.com/watch?v=XDt_4ha9Xjs
Skip to minute three and try not to kill yourself from listening to this guy's bullshit.
The exercises on this video are for left-hand independence purposes. Repeat these exercises over and over until you can
1) Play them at a considerably regular speed without paying much attention or giving it much effort
2) Play them at a considerably regular speed without breaking tempo. That means, no staccato, every note is supposed to last the same and is supposed to keep a steady beat.
Also, this guy never goes up the neck, you can also keep doing these exercises on higher notes. It's fun when you start doing it really fast.
You can also alternate this with right hand practice, using your index finger and middle finger to pick at the string alternately. Then alternate with the rest of the fingers, two at a time.
This and the chords is pretty basic, right now you need to develop your motor skills to the point where you could play any of these blindfolded. This is the hardest part, so keep at it until your fingers bleed.
Also, try to learn a bit of basic musical concepts. How to build chords yourself, the tonal disposition of your instrument, how scales are built and which notes form chords and what differentiates a minor chord from a major chord harmonically speaking, how dissonances work, concepts of enharmonics, how flats and sharps work, maybe do some scales. Brushing up on this will help you understand what you're doing and motivate you further.
Scales will help you improvise. In this guide you read they said to learn the pentatonic scale probably because it's the most used scale in blues and 70s rock&roll in general, but learning major and minor scales comes first imo. Leaning scales and understanding how they can be overlaid in a particular tone helps when you feel like improvising something or maybe writing a melody for some cadence you really like.
I hope this helps, OP.