Chofetz Chaim Daily 6 Shvat. Intro. The entire sefer was written as actual Halacha, not stringencies (unless specified). The sefer opens with a comprehensive introduction, with all the positive and negative commandments that one may transgress while speaking LH. Studying this will help one to restrain ones self.
Chofetz Chaim Daily 5 Shvat The sefer Chofetz Chaim was written to educate the public in keeping the laws of LH and Rechilus. Content is gathered from Rishonim and Poskim. The main text is concise law. Sources are spelled out in the Beer Mayim Chaim.