You will find that the General Purpose Relay makes building basic logic circuits feel more approachable and fun.
C7-A20DX DC24V Electromagnetic Relay 10A 250VAC w/Comat CS-18 Relay Socket x 1pc
A nice touch is the small indicator that lights up when the relay engages, so you can confirm activity at a glance.
The Formiden brand is right there on the relay, and that makes sorting through spares a little easier.