How to export contacts from SalesForce Lightning?

Exporting contacts from SalesForce is a pretty easy operation, by creating a report containing the contacts to export, and export that report to Excel or another available export format from SalesForce. The process is pretty similar to exporting data from SalesForce to Excel as it is the case for report export for example....
More information on this link

How to merge accounts in SalesForce Classic?

How to merge accounts in SalesForce? It might be necessary to perform a SalesForce merge accounts operation in several cases, especially while performing some data cleansing, and noticing that different SalesForce accounts registered actually represent the same account, but with slightly different data, such as a character wrongly entered, a SalesForce merge account operation becomes necessary. Also, when several clients merge together, or a former account left the company and has been transferred to another account, it might be necessary to merge both accounts in SalesForce....
More information on this link

How to merge contacts in SalesForce Classic?

How to merge contacts in SalesForce? Merging contacts from an account can only be performed on SalesForce Classic, and is a pretty straight forward operation. It will be especially useful to merge contacts in SalesForce during operations such as data cleansing, that might dig up some redundancy in the registered contacts. A SalesForce merge contacts operation will allow to cleanse the data that might be duplicated, by selected the right one amongst different records. See below how to merge contacts in SalesForce Classic to ensure the highest data accuracy possible....
More information on this link