Review on 📶 Sunhokey ESP8266 ESP-01 WiFi Transceiver Module + USB Adapter - Arduino UNO R3, Mega2560, Nano, Raspberry Pi (2 PCS) by Jim Ledbetter

The item description suggests that the supplied USB adapter can be used as a programming device, but this is not the case without modification. It took me about an hour to figure out why I couldn't load programs into the included ESP-01 modules. It turns out that the CH_PD pin needs to be pulled to VCC (always) and GPIO0 needs to be pulled to GND when you connect the USB adapter to your programming computer. You can add a jumper and a small button to this and turn the adapter into a programmer instead of just a serial monitor adapter. Here on Revain you can also find other USB adapters with a small switch to put the device into programming mode. They work as is and may be a better choice if you don't want to change them.