In general read the provided documentation and try to understand and follow this documentation, this should allow you to judge the usefulness of an item and will help you become aware of any issues that you may face relevant to you own installation of Content Server when implementing an item.
Ensure you validate each change in your specific setup as other patches, customisations etc may have altered the files / code from that presented here.
It is always recommended to thoroughly test out any changes on a development/test installation of Content Server before applying them to the 'live' server, as this will highlight any issues and reduces the chances that a change will affect your 'live' environment in a negative way. If you are looking at several changes, please apply them seperately to ensure that each beds in on their own and apply them in the same order on both environments. In many companies this will be managed by a 'Change Request' system.
Many people also find it helpful to maintain details of what the change you are making is, what it affects and how to safely remove it - although this is likely to be included in any 'Change Request' document. This complete Change History can then be used when you create another Content Server server or create a replica / replacement of your existing one to ensure that all the changes are copied across.
Please also read the Content Server section disclaimer which covers trademarks, support, liability etc.