Someone with a hands-on way of doing things becomes closely involved in managing and organizing things and in making decisions.

She's very much a hands-on manager. 她是一位事必躬亲的经理。

Someone who has hands-on experience of something has done or used it rather than just read or learned about it.

Many employers consider hands-on experience to be as useful as academic qualifications. 很多雇主都认为实践经验同学历一样有用。