I am in need to know what are the different approaches in migrating from SharePoint 2010 to 2013 . We have 6 wfe servers with 3 internal and 3 external and 3 app servers one for search one for user profile and the third one for others .we are having applications which are visual studio based custom WSP solutions and some of them are OOTB solutions. Are there any approaches which can be followed. And what are the things that needed to be considered while migrating from 201 to 2013, I am very new to this . Kindly suggest me on this. Thanks in advance.