Letters in Sanskrit are believed to be loaded with mystic power that are yielded when pronounced correctly.

The sanskrit alphabet is well categorized and hence easy to learn. The vowels and consonants are as follows:

Vowels

Table of Sanskrit Vowels

Consonants

Consonants are further categorized into several groups based on how they are pronounced.

Gutturals
These letters are pronounced from the throat.
Palatals
These letters are pronounced from the middle of the mouth.
Cerbrals
These letters are pronounced with the tounge hitting the roof of the mouth.
Dentals
These letters are pronounced with the help of the teeth
Labials
These letters are pronounced with the help of the lips.

Furthermore, the first two letters in each group are the hard consonants and the next two are soft consonants. The last letter in each group is a nasal i.e. the letter is pronounced with the help of the nose.

Table of Sanskrit Consonants

Semi-vowels, Sibilants, Aspirate

There are other consonants:

Semivowels
These letters are produced by combining vowels.
Sibilants
These are the "s" lettered-sounds.
Aspirate
This letter is pronounced from the throat.

Table of semivowels, sibilants, aspirate