Hi, how is your Friday going? my is alright, my car isn't doing so good though

My Lexus, 1996, ES 300 is leaking power steering fluid and I was hoping you guys could help me before I desire to spend money I don't have to have someone look at it. First off, this didn't just happen. it's been whining for about a month or so, but I'm pretty busy and didn't fully understand the problem tell now. I've been topping off my fluid but it only last a little over a week before it starts whining and I have to refill it.

I guess my real question is what can I do to figure out what's wrong myself and hopeful have a cheap fix. just let me know where to start =). thank you guy