Any libGDX text tutorials?

the reason why i want text tutorials is coos mostly all YouTube tutorials are so slow paste and dont explain so much what the code does for ex i have checked 4 tutorials still have no fucking clue wtf
SpriteBatch or Gdx.gl.glClear(GL30.GL_COLOR_BUFFER_BIT); does

have no idea where to setup all the drawing what object to use when i draw

i have done java2D for a long time and want to move to libGDX mostly coos of spine(Animation Software) and that libGDX can run on a lot off platforms

so link any not slow pasted video tutorials or text tutorials please it would really help
or some site that explains all the shit in libGDX