Splines

drawing splines
straights
curved
changing vertex type
line sub-objects
with spline sub-object selected, geometry/outline

extruding
extrude modifier

converting to editable polygon

lathe
make line curve in front vp
add lather modifier
move axis as desired

type bevel
rotate type 90 degrees
arial black
use 2 levels

sweep
on a curved line
show increasing line interpolation to 24
show variations of section presets

line rending
make a curved line
turn on renderable and viewport
increase thickness

Optional advanced study:

boolean action
select first spline (subobj)
hit boolean btn
hit the second spline (subobj)