Patch panels don’t have to be a straight butt weld.
Sometimes that’s the only option but look into a seam tool like this
https://www.summitracing.com/parts/mal-pf1ev
For long straight patches it helps keep the metal straight and eliminates the chance of burning threw.
Keep practicing but mix it up. Do some butts and some overlaps. Even some T welds the different angles will help you figure out tip positions and how they can change the weld
Once you get better. Then start practicing vertical and upside down. It’s never the same on the car as it is on the bench.
Check the backs of your panels to make sure you have the penetration.
When you finally get to welding patches the two most important things are temp control and corners
Jump around with your spot welds to stop any one part from getting hot and never cut a patch with a corner, give your patches a radius instead of corners. Corners will give you a high spot and then Week spot if you grind them down too far.
Any questions just ask. But mostly have fun it’s a great skill to learn.