While writing a thesis, there are statements like Corollary.5, Theorem.23, etc. I refer these and sometimes, I am adding some extra statements between these referred ones so that the Corollary.5 becomes Corollary.6. How to avoid these kind of problems?
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\begin{theorem}...\end{theorem}and similar environments to typeset theorems and the like. These environments can be set up to perform the numbering automatically. Then it is just a matter of setting a\labeland referencing it later with\ref. See en.wikibooks.org/wiki/LaTeX/Labels_and_Cross-referencing and en.wikibooks.org/wiki/LaTeX/Theorems (there are various packages for theorem labelling, butamsthmis one of the popular ones). There are fancy crossref packages such ascleverefthat can automate this further.