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Yarn Weight ConversionMatch yarn weight (US/UK) to hook size and gauge. Project Yardage EstimatorHow much yarn you need for common projects.Plain note about money: Some links are affiliate (eBay Partner Network). Small commission, doesn't change your price.
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Ergonomic crochet hook setRubber-grip ergonomic handles reduce hand fatigue on long sessions significantly. Clover Amour and Tulip Etimo are the two reliable brands.
Yarn bag / project toteA bag with a yarn port keeps your working ball tangle-free while you're crocheting on the go.
Locking stitch markersLocking markers clip onto stitches (vs sliding on needles like knitting markers). Buy 50+ — they get used fast.
Blocking mats (foam)Foam interlocking mats let you pin finished pieces to dry in shape. Essential for anything lace or fitted.
Tapestry needles (blunt)Blunt tapestry needles for weaving in ends don't split yarn. Buy a 10-pack — they disappear constantly.