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Whisks.
You own one. You need three.
A whisk is not one tool. The shape of the head decides what it can do, and the one in your drawer was almost certainly chosen for you by whoever packed the utensil set. Wide and springy puts air in. Narrow and stiff moves liquid. Those are opposite jobs and no single head does both well.
Start with these three
One wide, one flat, one small. Between them they cover almost everything most people cook.

Balloon · Wide bulbous head, thin springy wires
U-Taste Wire Whisk, 18/10 stainless, large
Twelve thin wires with enough flex to actually whip. This is the one for egg whites, cream and batters, and it is the easiest of the nine to clean. The base is sealed where the wires meet the handle, which is exactly where a cheap whisk traps gunk and starts to rust.
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Flat · Wires in a flattened U, lies almost level
All-Clad Specialty Flat Whisk, 13-inch
Lies flat against the pan so it reaches the corner where the roux is catching. This is the whisk most kitchens are missing and the one that fixes lumpy gravy. All-Clad is not the budget pick, it is the one you stop replacing.
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Mini · A balloon at half scale
OXO Good Grips Mini Whisk, 7.25-inch
Vinaigrette, two eggs, cocoa in a mug. It lives in the drawer and comes out far more often than you would guess, because most whisking is small whisking.
See it on AmazonThe rest, when you know which job keeps beating you
Every one of these is better than the first three at exactly one thing, and worse at everything else. Buy the fourth once a specific job has annoyed you enough to name it.

French · Slim and tapered, stiffer wires
Best Manufacturers Standard French Whip, 10-inch
Built to move liquid rather than beat air into it, which makes it the one for sauces, custards and emulsions. Poor on batters, so it does not replace the balloon. A commercial pattern, made for a line rather than a gift box.
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Spiral · One wire in a tight coil, head angled down
Rosle Stainless Steel Spiral Whisk, 10.6-inch
The angled head lets it work the bottom of a small bowl without flinging the contents up the sides. Dressings, lumps and small batches. Useless at volume, excellent below a cup.
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Ball · Loose wires tipped with beads, no cage
WMF Profi Plus Whisk, 27 cm
No cage means nothing gets trapped inside it and the loose wires reach into corners and down the neck of a jug. Good on dry mixes. Not the one for thick batter, which will simply stop it.
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Dough · Flat open loops, thick stiff wire
TEEVEA Danish Dough Whisk, wooden handle
Open loops in heavy wire move through bread dough and thick batter without packing solid the way a cage whisk does. If you have started baking sourdough, this is the tool that ends the fight with the spoon.
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Kettle · Long handle, large open cage
Winco FN-24 Stainless French Whip, 24-inch
Two feet of handle and a big open cage, for stockpots and real volume. It is sold as a French whip, which is the trade name for the shape rather than a claim that it is the 10-inch French above. The length is the whole point: it keeps your hands clear of the heat.
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Silicone · Coated wires, usually balloon shape
StarPack Premium Silicone Whisk, 600F
Coated so it will not score a nonstick pan. It is softer than bare metal and holds less air, so treat it as a compromise you make for the pan rather than an upgrade. Worth owning only if you cook on nonstick, and keep a metal one for everything else.
See it on AmazonOne honest note. Whisk names are a mess. Shops call the balloon a piano whisk, and the 24-inch kettle whisk above is sold as a French whip even though it is nothing like the 10-inch French. Sources genuinely disagree on where balloon ends and French begins. Buy by the shape of the head, not by the word on the label.