Sewing machine, serger, fabric scissors, tailor's snips, iron, ironing board, sleeve ham, body ham, fashion fabric, muslin, tailor's tape, ruler, hip curve ruler, arm scythe ruler, tracing paper, patterns, thread, interfacing, tailor's chalk, tracing paper, tracing wheel, hand needles, thimble, bobbins, pins, pressing cloth, serger thread cones, paper scissors, etc.
Techniques: measuring, pattern adjustment, pretreating fabric, pressing, marking, pattern drafting, hand sewing, machine sewing, button holes, sewing buttons, inserting zippers, grading seams, seam finishing, easing, gathering, hemming, inserting linings, using interfacing, collar sewing, turn of cloth, burrito method, piping, bias binding, hanging bias fabric, matching patterns and stripes, grainlines, napped fabrics, etc.
Take a sewing class at a local community College or from a sewing store. Watch videos. Practice. Practice some more. Buy books/get from library. Practice more.