title_body: How to keep track of a language?
upvoted_answer: One way, while working on paper is to divide things into multiple sheets, making sure to have plenty of extra space at the bottom of dictionary sheets, or alternatively grouping things via e.g. semantic field to not run into the alphabetisation issue to quite the same extent (though this can have the issue that the semantic field of some items might not be easily determineable).
  
  You can also use a computer program to manage your vocabulary, which offers the benefits of easy searchability and ordering. A simple spreadsheet program of your choosing is enough to work in a lot of cases, and otherwise there is the possibility of using actual vocabulary management programs. There are several free ones availible, both conlang-specific ones such as Polyglot (which also has a bunch of other functionality for organising a bunch of other conlanging-related stuff) or one developed for natlangs but still useful for conlangs, such as SIL FieldWorks (which is quite powerful but has a bit of a learning curve).