Hi Arun Kumar KS Thanks for reaching out. could you please let me know if you want to trigger your logic app when an event occurs at the salesforce end? If yes, then there are two triggers available as of now in the logic app and you can refer to trigger section for more details. Similarly, you can refer to the actions that salesforce connector supports.
You can refer to Saleforce document on how you can connect to the salesforce connector.
Feel free to get back to me if you need any assistance.