3 Always Use Certified Charging Gear
Similar to counterfeit or low-quality batteries, you definitely want to stick to first-party or Apple-certified MFi charging accessories. This is particularly important for cables, but it goes for power adapters and wall chargers, as well.
Low-quality counterfeit charging products are cheaper, but they are actually quite dangerous and can cause your device serious harm. Buy charging products directly from Apple, or at least make sure that the company offers MFi (Made for iPhone)-certified gear.