building blocks
US /ˈbɪl.dɪŋ blɑks/
UK /ˈbɪl.dɪŋ blɑks/
1.
a set of solid blocks, typically made of wood or plastic, used as a child's toy for building things
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The children spent hours playing with their building blocks, creating tall towers and intricate castles.
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The toddler stacked the colorful building blocks one on top of the other.
2.
fundamental units or components from which something is made or constructed
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Trust and communication are the essential building blocks of any strong relationship.
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Learning basic arithmetic is a crucial building block for understanding more complex mathematics.