I mean investing in education or renovating your equipment
But you can be a scam too

For instance, you enroll to university and then you stop giving a crap and join the army of expelled. Or you buy a flute and don't play it at all.
To invest in yourself is not only a university. It can be a purchase of modern technology, the purchase of training courses or licensed software. This is any action that develops you. You think too narrowly. Surely you are a student