Well first I am a complete and utter noob in Blender, so treat me like a 5-year-old (and maybe I can learn faster, oh and take the piddle out of me :) with a nice bit of banter ).
I'm an artworker, and I'm getting into creating some 3D artwork in Blender and create some basic shapes with some small knowledge of blender, but I still cannot understand what a biezer or a node is or even spell it right. So that's my level in 3D. Give me Photoshop/Illustrator/InDesign any day.
I can draw perfectly in Adobe Illustrator and save an SVG file 1.1 from Illustrator (now this SVG file might not be the way to go) as you will see in the poor attempt below:
So as you can see above, a whole load of noise which I guess is because of the curve or SVG file (so pointer number 1 from you geniuses for a fix or best way forward - with details on how to draw/fix this shape in blender 2.8X) EDIT Subsurface Modifier did the weird stripes.
The next thing is... how the hell you put a cap on this thing, I've tried 'Solidifier' with a minus number in to fill it in, but that is obviously not the way to go.
This screenshot below is the blender layout mode... yes it looks nice doesn't it, with its nice curves and oh so innocent look... but when I render it, the devil is within.
I've gone through so many video's, tutorials and google searches I'm now calling on 'Tech Support' aka StackExchange.