Just for everyone to know, the secret to better soldering is good solder alloy but far more importantly to have the right flux. Flux is the magic your soldering skills are missing, I also recommend a good iron, a good clean off station and holder and most importantly it needs to have a thermostat control so you cna put the right temperature point to the work you are doing.
So flux is the magic, and that other stuff too, and skill, and clean and tin your iron as you work.
So just flux skills, right guys?

but getting serious again read this, print it, save it, scribe it out a thousand times on unetched PCBs using solder as your ink your weller soldering station as your quill, hand it out, preach it, and be free:
https://www.onsemi.com/pub/Collateral/SOLDERRM-D.PDF
Now go forth and sin no more!