7.18A useful beginner texture

Use:

Left hand:

single root

Right hand:

chord under melody

Example:

Melody G, chord C:

LH: C

RH: C E G

Melody A, chord F:

LH: F

RH: C F A

Melody B, chord G7:

LH: G

RH: D F B

Melody C, chord C:

LH: C

RH: E G C

That already sounds like a real arrangement.