https://www.allaboutcircuits.com/

https://maker.pro/ 

https://circuitdigest.com/

https://hackaday.com/

https://diyodemag.com/projects

https://dronebotworkshop.com/

electronics express

https://www.electronics-lab.com/

https://www.hackster.io/

https://learn.adafruit.com/guides/latest

http://amasci.com/ 

https://www.amazing1.com/

https://www.allelectronics.com/

https://www.pololu.com/ 

https://www.jameco.com/

https://www.digikey.com/en/maker

https://www.instructables.com/circuits/

https://www.makershed.com/

https://www.tinkercad.com/?utm_swu=7997

https://www.sparkfun.com/

https://www.rs-online.com/designspark/new-products

https://www.seeedstudio.com/

https://www.vernier.com/

https://www.edmundoptics.com/

http://www.openscientist.org/

https://www.sciencebuddies.org/

https://www.scientificsonline.com/

https://shop.wickeddevice.com/

https://www.sunfounder.com/

https://www.elegoo.com/

http://www.kumantech.com/

https://www.elenco.com/

https://joeknowselectronics.com/

https://www.homesciencetools.com/

http://www.forcetronics.com/

https://store.digilentinc.com/

http://www.libelium.com/

https://www.robotshop.com/community/

https://hackspace.raspberrypi.org/

https://www.hackster.io/

https://www.instructables.com/

https://www.tinkercad.com/

https://makezine.com/

https://make.co/

https://rickettslab.org/

https://www.allaboutcircuits.com/

https://www.allaboutcircuits.com/

https://www.element14.com/community/welcome

https://www.circuitbasics.com/

http://amasci.com/index.html

https://hackaday.io/projects

https://www.mysensors.org/

https://www.engineersgarage.com/

https://www.thingiverse.com/

https://earthquake.usgs.gov/monitoring/volunteer/

https://scistarter.org/

https://publiclab.org/

https://randomnerdtutorials.com/

https://shop.switchdoc.com/

https://www.sunfounder.com/

https://mad-science.wonderhowto.com/

https://shop.evilmadscientist.com/