Are you trying to learn how to make a conversation with a girl?  This is a tough thing for many guys, but you can overcome the difficulty of approaching women by practicing these three simple steps.

1. Don't freeze up.

If you allow fear to paralyze you, you will never have the success you desire with women.  Your fear will also intrude on other social areas of your life, making it difficult to talk to people.

So, even though you feel the fear coming on when you try to work up the nerve to talk to a girl, just allow it to come, and then let it go. 

Eventually, once you over come this "freeze-up", the fear won't even be a big deal anymore.

2. Don't be too attached to outcomes.

It's harder to get a girl's number or even work up the nerve to talk to her if you're focused too much on getting a date with her or getting her number.

It's much easier if your only goal is to talk to her.  You can simply ask her for the time, or where the local smoothie place is.

The more you do this, the easier it will get to talk to women.

3. Try to stick to neutral topics, or ask a question.

Asking a question is a great way to approach a girl, and can be an easy way to learn how to make a conversation with a girl, because she'll often just start talking to you.  Of course, this assumes you're a likeable, reasonably attractive person, but as long as you work on your appearance and keep a positive frame of mind, she'll usually find you attractive.

Stick to neutral topics in your first conversation.  Say, if you both live in a college town, talk about the university.  Or if you just live in a regular city, the weather, or local events, are good topics to stick to.

Just don't try to pry too much or ask personal questions during your initial approaches.

Ultimately, the best way to get good at approaching and talking to girls is to practice.  The more you practice your conversational skills, the easier it will get to talk to people.

You should, by the way, be talking to men, women, young people, old people, and people of all body shapes and types.  Don't just talk to women; your social skills will improve a lot more quickly (AND you'll have a larger conversation arsenal) if you talk to all the people you can.

Just make it a habit to chat people up everywhere you go - the grocery store, at your workplace, the gym, etc.  The more you get out there and get talking, the easier it will be to learn how to make a conversation with a girl.