In SharePoint 2013 we can edit existing master page to hide top links and change logo. But before doing that we need to copy the existing master page and edit it. Following are the steps to edit the master page to change the logo and hide the top navigation links.
Download the master page (Seattle.master) from SharePoint site master page gallery.
Open it in any editor like SharePoint designer or Visual studio or note pad.
To remove the text “SharePoint” on the top left, check for the code below,
Delete or comment the code to remove “SharePoint” text.
To hide newsfeed, SkyDrive and Sites, Check for
Delete or comment the above code to remove or hide NewFeed, SkyDrive, Sites.
To hide Share, Follow and Sync check for
Delete or comment the above code.
To change the logo
Change the LogoImageUrl to the logo that we want to display in the site. The image url should be logo image.
Once done with the changes upload the master page in the master page gallery as “ASP NET Master Page” as content type. Publish the master page as a major version. Once done, set the master page as primary master page of the site.