Check out example codes for "gersener waves". It will help you in understanding the concepts better.

Code Example 1

Shader "Custom/Waves" {
	Properties {
		_Color ("Color", Color) = (1,1,1,1)
		_MainTex ("Albedo (RGB)", 2D) = "white" {}
		_Glossiness ("Smoothness", Range(0,1)) = 0.5
		_Metallic ("Metallic", Range(0,1)) = 0.0
        _Amplitude ("Amplitude", Float) = 1
	}
	SubShader {
		Tags { "RenderType"="Opaque" }
		LOD 200

		CGPROGRAM
		#pragma surface surf Standard fullforwardshadows
		#pragma target 3.0

		sampler2D _MainTex;

		struct Input {
			float2 uv_MainTex;
		};
        
        half _Glossiness;
		half _Metallic;
		fixed4 _Color;
		float _Amplitude;

		void vert(inout appdata_full vertexData) {
			float3 p = vertexData.vertex.xyz;

			p.y = _Amplitude * sin(p.x);

			vertexData.vertex.xyz = p;
		}

		void vert(inout appdata_full vertexData) {}

		void surf (Input IN, inout SurfaceOutputStandard o) {
			fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
			o.Albedo = c.rgb;
			o.Metallic = _Metallic;
			o.Smoothness = _Glossiness;
			o.Alpha = c.a;
		}
		ENDCG
	}
	FallBack "Diffuse"
}

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