How to measure speed and direction in high accuracy, low speed and low cost

hi (first post! forgiving

i got little toy car (about  6cm wheel diameter)  running small stepper motors @ low speed.
i'm trying capture movement. i'm using sort of reflection sensor , little cardboard fan made placed on wheel axle.
though it's accuracy want (it has 24 holes , 24 wings. ~8deg?),  it's not robust , doesn't capture direction.

there million ways measure these (from i've found, @ least 3 optic ones, 3 magnetic ones, gyros , more) , each find myself reading ages , not being sure if fits, or try find parts , find out super expensive.  of post found bicycle different.
so thought maybe here have experience , knowledge tell me what's best solution me.

thanks!

quote

i find myself reading ages , not being sure if fits,

this called learning curve, should not afraid of it.

it seems found right sensors , best way find 1 has library , start going through examples.

lot of learning curve can fun actual building thing.

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