how do you know pokemon card value

how do you know pokemon card value of original cards I found from childhood : r/PokemonCardValue Pokemon Card Worth Checker -

Name: how do you know pokemon card value of original cards I found from childhood : r/PokemonCardValue Pokemon Card Worth Checker -
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Description

First and foremost, 160 HP makes it two leagues better than the usual 140 HP cards in TCG Pocket

Another interesting fact is that, all in all, Charizard cards are more valuable than any other Pokemon cards

The sealed product itself is a commodity with a price determined through supply and demand

This historical significance, combined with the set's relative scarcity and long list of sought-after Crystal and holographic cards, has made it one of the most coveted WOTC sets