The sources given at the end of some topics are so much helpful and easy to understand. Do learn from there as well.
Brief explanation which will surely help you:
*Noun
Proper Noun (e.g., Ali, Pakistan)
Common Noun (e.g., boy, city)
Collective Noun (e.g., team, class)
Abstract Noun (e.g., honesty, love)
Concrete Noun (e.g., table, dog)
*Pronoun
Personal Pronoun (I, you, he, she)
Possessive Pronoun (mine, yours)
Reflexive Pronoun (myself, herself)
Demonstrative Pronoun (this, that)
Interrogative Pronoun (who, what)
Relative Pronoun (who, which, that)
Indefinite Pronoun (someone, anything)
*Verb
Main Verb (run, eat)
Helping Verb (is, have, will)
Transitive Verb (needs object, e.g., eat food)
Intransitive Verb (no object, e.g., sleep)
Linking Verb (is, seem)
*Adjective
Descriptive Adjective (beautiful, tall)
Quantitative Adjective (some, many)
Demonstrative Adjective (this, those)
Possessive Adjective (my, your)
Interrogative Adjective (which, what)
*Adverb
Adverb of Manner (quickly, slowly)
Adverb of Time (now, yesterday)
Adverb of Place (here, there)
Adverb of Frequency (always, often)
Adverb of Degree (very, too)
*Preposition
Preposition of Time (in, on, at)
Preposition of Place (under, above)
Preposition of Direction (to, into)
*Conjunction
Coordinating Conjunction (and, but, or)
Subordinating Conjunction (because, although)
Correlative Conjunction (either..or, neither..nor)
* Interjection
Mild Interjection (oh, well)
Strong Interjection (wow!, alas)