The translation of the word Tehilim is Praises, and it refers to the book of Psalms (one of the 24 books of the Bible, the Tanakh).
Each of its 150 chapters deals with a different theme. Many were composed by King David, others by the first man, Moshe, Asaph haLevi (from the time of the First Temple), and various other authors.
It is a Jewish custom that in times of difficulty, Tehillim are recited to seek merit and try to annul any negative decree that may exist against the person in the heavens.
All the Psalms are Torah and are powerful, but it is generally recommended to read Psalms 20, 130, and 150. However, this is one of those things where adding to it and saying "more" only adds to it and does not diminish its merit at all.
The introduction states the importance of studying and meditating on the samos.
If they could put it in a digital book, it would be easier to study for those of us who don't have the book of psalms.
Shalom Miguel
B"H
Hi Miguel, here you can find the book of Psalms:
http://www.es.chabad.org/library/article_cdo/aid/701030/jewish/Tehilm.htm
Greetings,