Correction of errors of connection of libraries and scripts

Make a joomla. Im just learning to write. Now in a deadlock – when connecting multiple libraries there is a conflict, is no longer available faviconico, in the console 6 error(doesnt find these libraries), the connections are written in body, not in head. When prescribing class bootstrap the content is not divided into columns. Need a specialist that would help solve the problem and give recommendations for elimination of warnings.