Foliar feeding is feeding your plants by spraying your plant food/fertilizer directly on the leaves of the plants instead of applying it to the ground. You can do this with fish emulsion, kelp, or even one of the "miracle grow" products, all available at most garden centers and big box stores.
Just curious, what kind of soil did you use for your containers and beds? And did you add any amendments to it like manure, lime, etc?
Shoe, wishing you a good time newbie gardening, quite often the funnest stage of gardening!