Use Ibid. when citing a source that you just cited in the previous footnote. (Ibid. is an abbreviation of ibidem meaning "from the same place.)" Because Ibid. is an abbreviation, a period is always included after Ibid.. If you are citing the same page number, your footnote should only include Ibid..

Is Ibid no longer used?

One such change was retiring ibid., the abbreviation (short for Latin ibidem, or “in the same place”) used to tell readers that the endnote or footnote they're looking at refers to the same source as the previous note. ...

What can I use instead of ibid?

Ibid. is an abbreviation for ibidem, meaning "in the same place." The current (17th) edition of the Chicago manual discourages the use of Ibid. and instead recommends use of shortened form for all repeat citations. 1. Doug Fine, Farewell My Suburu: an Epic Adventure in Social Living (New York: Villard, 2008), 45.