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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SKU: 65745039548
Price: 26.67 USD
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SKU: 65745039548

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Description

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

[F][F][C] Mach Cross: 120 damage

Buy your authentic Japanese Long Card Box Gigantamax Urshifu online

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