Hey kitty !
Welcome to the forums !
If you want to learn more about the Pokemon TCG, you could use online browser based websites such as bebesearch and playtcg.me
Using these sources you can build a casual deck or a tournament standard deck to play with others.
If you want more of a "hands on approach" to learning, you could buy 2 theme decks and play with a friend to learn how to play the game or play with us online using these resources !