@lost815execute , John , Other then the vast info. on the net in repairing electronics, I would suggest try to get part time/full time job at a good electronics repair shop that interests you. There hopefully you will gain knowledge looking over the shoulder of a master Tech., who may see your interest and can share his knowledge, technique, specialty tools, etc.. Another way possibly is to gain knowledge through on line or in class training courses as seen in links below, which you can do a search on for your preferences. Good luck.
I hope this helped you out, if so let me know by pressing the helpful button.
https://mengtormdtraining.com/?gclid=CL3HwYO9-dECFZWCaQodgo0LWg
http://cellphonerepairtraining.ca/
https://online-tech-training.com/gb/et_v14/?campaign=ET-PPCS-US-NB-GBC&gclid=CMr10Z27-dECFYS4wAodcBgGxg
http://study.com/electronics_repair_training.html