In this latest video from John Teel, electronic components to avoid in a real product:

1. USB Micro-B Connections → use USB-C instead
2. Through-Hole Components → use SMD instead
3. Barrel Jack Power Connections → use USB-C instead
   • Note: 5.5 × 2.1 mm (5.5×2.1mm) is the common DC barrel jack size, 5.5 × 2.5 mm (5.5×2.5mm) is less common
4. Unshielded DC-DC Converter Inductors → use shielded inductors instead
5. Cheap No-Name Electrolytic Capacitors → buy from reputable brand instead, or, better, switch to ceramic or polymer aluminium capacitors
   • If you want no surprises, stick to: Nichicon, Rubycon, Panasonic, Nippon Chemi-Con (aka United Chemi-Con), Elna
   • For professional/industrial designs, also consider: KEMET, Vishay, TDK
6. Bare Pin Headers as Production Connectors → use connectors rated for your application instead
7. Mechanical Relays → use solid state instead, for DC consider MOSFET
8. Single-Source or End-of-Life Components → use widely available components instead
9. Counterfeit of Clone ICs → buy from authorized distributors instead:
   • Mouser
   • DigiKey
   • Arrow
10. Hobby-Grade Sensors → look for higher grade instead with I2C or SPI digital interfaces