A few different websites that will teach you how to solder.
https://www.sciencebuddies.org/science-fair-projects/references/how-to-solder
https://www.instructables.com/id/Soldering-wires-together/
https://www.popularmechanics.com/cars/a1430/4213013/
These will hopefully help you with your engineering projects in the future.
