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Composable functions emit UI hierarchy by calling other composable functions. The function doesn't return anything. Compose functions that emit UI do not need to return anything, because they describe the desired screen state instead of constructing UI widgets.

The critical difference between Column and LazyColumn lies in their rendering mechanism. Rendering: While Column will render all its children regardless of whether they're visible on the screen or not, LazyColumn only renders items that the user can currently see.

Rows and columns are two basic layout containers in Jetpack Compose. A row is a container that aligns elements horizontally, while a column is a container that aligns elements vertically. Rows and columns can be nested within each other to create complex user interfaces with multiple levels of hierarchy.

In many cases, you can just use Compose's standard layout elements. Use Column to place items vertically on the screen. Similarly, use Row to place items horizontally on the screen. Both Column and Row support configuring the alignment of the elements they contain.

Surface is used when you want a surface for your UI , you can set the background color, shape etc. Card on the other hand, have default elevation(Material Design Standard) and pretty much have every property as the surface .

Alignments and arrangements help us to position child elements inside the parent container. The following layouts are available in Jetpack Compose: The "Box" layout stacks every child on top of each other. The "Column" layout stacks children in a vertical sequence.

Recomposition is when Jetpack Compose re-executes the composables that may have changed in response to state changes, and then updates the Composition to reflect any changes. A Composition can only be produced by an initial composition and updated by recomposition.

LazyColumn is also a Composable function that arranges its children in a vertical sequence. However, it works differently than Column ? it is ?lazy?. It means that LazyColumn only renders the items currently visible on the screen, making it much more efficient when dealing with large lists.