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Showing content from https://docs.unity3d.com/Manual/urp/use-built-in-shader-methods-shadows.html below:

Manual: Use shadows in a custom URP shader

Use indirect lighting in a custom URP shader

ShaderLab Pass tags in URP reference

To use shadows in a custom Universal Render PipelineA series of operations that take the contents of a Scene, and displays them on a screen. Unity lets you choose from pre-built render pipelines, or write your own. More info
See in Glossary (URP) shaderA program that runs on the GPU. More info
See in Glossary, follow these steps:

1. Add #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl" inside the HLSLPROGRAM in your shader file. The Core.hlsl file imports the Shadows.hlsl and RealtimeLights.hlsl files.
2. Use any of the methods from the following sections.

Use these methods to convert positions to shadow map positions.

The following methods calculate shadows using shadow maps. To use these methods, follow these steps first:

1. Make sure there are objects in your sceneA Scene contains the environments and menus of your game. Think of each unique Scene file as a unique level. In each Scene, you place your environments, obstacles, and decorations, essentially designing and building your game in pieces. More info
   See in Glossary that have a ShadowCaster shader pass, for example objects that use the Universal Render Pipeline/Lit shader.
2. Add #pragma multi_compile _ _MAIN_LIGHT_SHADOWS _MAIN_LIGHT_SHADOWS_CASCADE _MAIN_LIGHT_SHADOWS_SCREEN to your shader, so it can access the shadow map for the main light.
3. Add #pragma multi_compile _ _ADDITIONAL_LIGHT_SHADOWS to your shader, so it can access the shadow maps for additional lights.

This code example is a simplified example of drawing shadows onto a surface. It might not work correctly with more than one shadow cascade.

To generate shadows, make sure there are objects in your scene that have a ShadowCaster shader pass, for example objects that use the Universal Render Pipeline/Lit shader.

Shader "Custom/SimpleShadows"
{
    SubShader
    {

        Tags { "RenderType" = "AlphaTest" "RenderPipeline" = "UniversalPipeline" }

        Pass
        {
            HLSLPROGRAM

            #pragma vertex vert
            #pragma fragment frag
            #pragma multi_compile _ _MAIN_LIGHT_SHADOWS _MAIN_LIGHT_SHADOWS_CASCADE _MAIN_LIGHT_SHADOWS_SCREEN

            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl"

            struct Attributes
            {
                float4 positionOS  : POSITION;
            };

            struct Varyings
            {
                float4 positionCS  : SV_POSITION;
                float4 shadowCoords : TEXCOORD3;
            };

            Varyings vert(Attributes IN)
            {
                Varyings OUT;

                OUT.positionCS = TransformObjectToHClip(IN.positionOS.xyz);

                // Get the VertexPositionInputs for the vertex position  
                VertexPositionInputs positions = GetVertexPositionInputs(IN.positionOS.xyz);

                // Convert the vertex position to a position on the shadow map
                float4 shadowCoordinates = GetShadowCoord(positions);

                // Pass the shadow coordinates to the fragment shader
                OUT.shadowCoords = shadowCoordinates;

                return OUT;
            }

            half4 frag(Varyings IN) : SV_Target
            {
                // Get the value from the shadow map at the shadow coordinates
                half shadowAmount = MainLightRealtimeShadow(IN.shadowCoords);

                // Set the fragment color to the shadow value
                return shadowAmount;
            }
            
            ENDHLSL
        }
    }
}

• ShadowsA UI component that adds a simple outline effect to graphic components such as Text or Image. It must be on the same GameObject as the graphic component. More info
  See in Glossary
• Shadows in URP
• Writing custom shaders
• Upgrade custom shaders for URP compatibility
• HLSL in Unity

Use indirect lighting in a custom URP shader

ShaderLab Pass tags in URP reference

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