How to Add a Custom Button to Page Layout in Salesforce

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Here’s a step-by-step tutorial on how to add a custom button to a page layout in Salesforce:

1. Navigate to Setup and go to Object Manager.
2. Locate and click on the specific object where you want to add the button (e.g., Account, Opportunity). 
3. Look for the Buttons, Links, and Actions in the left pane.
4. Click the New Button or Link button on the top right to create a new custom button.
5. Configure the Button: A new window will open where you can define the button's properties like:some text
   • Label: The text is displayed on the button.
   • Name: The internal name for the button.
   • Display Type: Select and choose between a link or a button.
   • Behaviour: Eg. Displaying in a new window
   • Content Source: Depending on the action type, you may need to specify content, such as the URL to navigate to or the Apex code to execute.
6. Once you've configured the button, click Save.
7. Now, head over to the Page Layout in the left pane. Select Buttons to see your newly created custom button.
8. Click and hold the button, then drag it to the desired section of the page layout and click Save to apply the changes to the page layout.