http.begin("http://192.168.100.5/NodeMCU_RC522_Mysql/getUID.php"); //Specify request destination

Using Arduino Programming Questions
1

Arduino: 1.8.12 (Windows 10), Board: "NodeMCU 1.0 (ESP-12E Module), 80 MHz, Flash, Disabled (new aborts on oom), Disabled, All SSL ciphers (most compatible), 32KB cache + 32KB IRAM (balanced), Use pgm_read macros for IRAM/PROGMEM, 4MB (FS:2MB OTA:~1019KB), 2, v2 Lower Memory, Disabled, None, Only Sketch, 115200"

C:\Users\Daisy-Ann Ylarde\OneDrive\Documents\Arduino\NodeMCU RFID RC522 MYSQL\NodeMCU_V3_RFID_RC522_DB\NodeMCU_V3_RFID_RC522_DB.ino: In function 'void loop()':
NodeMCU_V3_RFID_RC522_DB:103:15: error: call to 'HTTPClient::begin' declared with attribute error: obsolete API, use ::begin(WiFiClient, url)
103 | http.begin("http://192.168.100.1/NodeMCU_RC522_Mysql/getUID.php"); //Specify request destination
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
exit status 1
call to 'HTTPClient::begin' declared with attribute error: obsolete API, use ::begin(WiFiClient, url)

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

2

Post your complete code. Use code tags.

Edit your post above and put code tags around the error messages.

3

I'm not sure why you think that this relates to Avrdude, stk500, Bootloader issues - Arduino Forum but you have a problem that fits better in Programming Questions. Hence your topic has been moved.

As mentioned above, nobody will be able to solve your problem without seeing the code. Please read How to get the best out of this forum (again?).