BGA soldering practice board based on HC32F460PEHB

The project description
has always been limited by BGA chip soldering, preventing me from DIYing any Linux projects. The reason for making this soldering board is to learn BGA chip soldering skills.
Once I acquire BGA soldering skills, I can freely DIY projects without hesitation.
Let's strive together!
 
The baseboard
 
/core board (requires immersion gold plating, as immersion gold boards are better for BGA soldering)
 
consists of:
HC32F460PEHB-VFBGA100 chips (5 RMB each on Taobao; buy more for practice); one UMW AMS1117-3.3S UMW
Type-C connector; two 0603 10UF capacitors; several 0402 10K resistors (all resistors should be soldered to 10K) ; several 0603 SMD LEDs; and several 0402 SMD LEDs . Personal experience in soldering 100nF capacitors , 1.27mm single-row pin headers and single-row female headers without soldering buttons, and BGA chip soldering : Step 1: Apply a small amount of solder paste to the immersion gold BGA pads (note: only a small amount); and blow it off with a hot air gun. Step 2: Place the BGA chip on the PCB and align it according to the PCB silkscreen. Alignment is very important. Step 3: After aligning the BGA chip, use tweezers to hold it in place and apply a small amount of solder paste to the top of the BGA chip, then release the tweezers. Step 4: Set the hot air gun temperature to 400℃ and the airflow to the lowest setting (level 2 or 3). Using a low airflow is also important, as a high airflow will blow the BGA chip out of place. Step 5: Heat evenly with the hot air gun, circling the BGA chip. Step 6: Heat the BGA chip with a hot air gun for about 2 minutes, then gently touch it with tweezers to return it to its original position (the melting time of the BGA solder paste depends on the actual situation and may not be exactly 2 minutes). Then heat evenly for another 5-6 seconds. Step 7: After the PCB cools, use a multimeter in diode mode to test if the BGA I/O ports are properly soldered. Ground the multimeter's positive terminal and measure each I/O port with the negative terminal. The measured voltage should be around 0.56V, with two I/O ports showing 0.52V. Step 8: If the voltage measured for each I/O port is correct, congratulations, the BGA soldering is almost complete. Measure the power and ground connections to check for short circuits. Step 8 indicates whether the BGA is properly soldered. If the soldering is good, then solder the reset circuit and header pins, and then insert it into the baseboard for downloading and verification. This is just my personal experience; everyone has their own method.