these are relays and transistors that amplify your microprocessor outputs to switch higher voltage or high current.

15A 400W MOSFET Trigger Switch Drive Module PWM Regulator Control Panel	https://www.aliexpress.com/item/15A-400W-MOSFET-Trigger-Switch-Drive-Module-PWM-Regulator-Control-Panel/4000609702577.html
5v 1 2 4 8 Channel Relay module with optocoupler. Relay Output X way relay module for arduino 1CH 2CH 4CH 8CH	https://www.aliexpress.com/item/5v-1-2-4-8-Channel-Relay-module-with-optocoupler-Relay-Output-X-way-relay-module/32340914033.html
5v 1 2 4 8 Channel Relay module with optocoupler. Relay Output X way relay module for arduino 1CH 2CH 4CH 8CH	https://www.aliexpress.com/item/5v-1-2-4-8-Channel-Relay-module-with-optocoupler-Relay-Output-X-way-relay-module/32340914033.html
Low Level 5V 1/2/4/8 Channel Solid State Relay Module SSR G3MB-202P 240V 2A Output with Resistive Fuse For Arduino 1 2 4 8 Way	https://www.aliexpress.com/item/Low-Level-5V-1-2-4-8-Channel-Solid-State-Relay-Module-SSR-G3MB-202P-240V/32788946442.html
5v 1 2 4 8 Channel Relay module with optocoupler. Relay Output X way relay module for arduino 1CH 2CH 4CH 8CH	https://www.aliexpress.com/item/5v-1-2-4-8-Channel-Relay-module-with-optocoupler-Relay-Output-X-way-relay-module/32340914033.html
Four Channel 4 Channel Way Route MOSFET Button IRF540 V4.0+ MOSFET Switch Module DC Motor Drive Dmimmer Relay Board	https://www.aliexpress.com/item/Four-Channel-4-Channel-Way-Route-MOSFET-Button-IRF540-V4-0-MOSFET-Switch-Module-DC-Motor/32970614613.html
4 Channel 5V Relay Shield Module Four Channel Relay Control Board Relay Expansion Board Diy Kit	https://www.aliexpress.com/item/4-Channel-5V-Relay-Shield-Module-Four-Channel-Relay-Control-Board-Relay-Expansion-Board-Diy-Kit/32883273857.html
Mini DC-DC 4.5V-35V 5A 90W PWM DC Motor Speed Controller Module Speed Regulator Control Adjust Adjustable Board Switch 12V 24V	https://www.aliexpress.com/item/Mini-DC-DC-4-5V-35V-5A-90W-PWM-DC-Motor-Speed-Controller-Module-Speed-Regulator/32880286661.html
ESP8266 ESP-01S 5V WiFi Relay Module Things Smart Home Remote Control Switch for Arduino Phone APP ESP01S Wireless WIFI Module	https://www.aliexpress.com/item/ESP8266-ESP-01S-5V-WiFi-Relay-Module-Things-Smart-Home-Remote-Control-Switch-for-Arduino-Phone/32890526507.html
ESP8266 ESP-01S 5V WiFi Relay Module Things Smart Home Remote Control Switch for Arduino Phone APP ESP01S Wireless WIFI Module	https://www.aliexpress.com/item/ESP8266-ESP-01S-5V-WiFi-Relay-Module-Things-Smart-Home-Remote-Control-Switch-for-Arduino-Phone/32890526507.html
Power Control IFTTT WiFi emabled Relay	https://www.pbtech.co.nz/product/SURBRS20925/Brilliant-Smart-Smart-WiFi-Wall-Plug-with-Energy-M?gclid=CjwKCAjw07qDBhBxEiwA6pPbHuJJlwxhymXAhPK7GjJLoaswdwS0Ryh275KkY2Fhs56yhh1GR8J3URoCEE0QAvD_BwE
Smart Smart WiFi Wall Plug with Energy Monitoring Access	https://www.pbtech.co.nz/product/SURBRS20925/Brilliant-Smart-Smart-WiFi-Wall-Plug-with-Energy-M