
There are 26 alphabets in the English language. They are:

It is very important to know all the alphabet sounds.
Many grammar concepts, formation of words & spellings, phonetics, etc. are dependent on the alphabets & their sounds.
It is a speech sound which is not a vowel.
There are 21 consonants in the English language:

The speech sound of vowels is made without any blockage of air due the parts of the mouth.
There are 5 vowel letters:

The letter 'Y' sometimes acts as a vowel.
Examples: cat, boy, family, garden, etc.
Words come together to form meaningful sentences, phrases, clauses, etc.
This helps us to communicate thoughts, ideas, actions, objects, etc.
Hence, words are fundamental base of a language.
For correct written & spoken English, usage of right words is very important.
For more details on how words are formed, remembering spellings, correct usage of words, phonetics, etc, refer here.
In this course, we laid the foundation of basic English language by learning about the alphabets, consonant & vowel sounds and word basics.
Thus,

In the next chapter, we will learn how words form different parts of speech.