1. Covering hair with silk wraps/caps at night
there are many benefits to wrapping your weave every night before hitting the sheets. Silk wraps or silk pillowcases help keep in moisture in. For dry hair, this is especially important. If it's wrapped around your scalp the satin helps avoid bushy edges. So you can thank your silk wrap/cap/pillowcase when you wake up with edges that are laid out to the gods!

2. Heat Protectant. ALWAYS!

This keeps the hair from looking dried out and keeps your extension ends looking luscious.

3. A wide-toothed comb is your new best friend.

Combing out your hair using a wide-toothed comb instead of a regular paddle brush helps prevent damage and breakage to your weave. Especially on wet hair, when it is most fragile.

4. Condition! Condition! Condition!
Deep conditioning your weave will leave it looking and feeling lustrous. It's crucial that you deep condition your weave periodically while it is installed.

5. Invest in your hair
When I say invest in your hair, I mean purchase hair you can re-use time and time again. This means good quality human hair. It might seem like a lot at purchase, but I have done the math and compared between a one time payment of high quality hair that will last me 6 - 8 months of reusing depending on how I treat it--to rebuying hair every time I get my weave done (which is often for me). I found it's much smarter for gals on a budget to invest in our hair purchases.

Source: Black Hair Spot
http://blackhairspot.com/index.cfm?page=hair-talk.5-tips-tricks-weave