How to Clean your Ukulele
Different types of finish prefer different methods of cleaning and polishing, but the easy rule is to not use furniture cleaner or household wood cleaning chemicals on your ukulele. You're usually safe with a good quality guitar polish like the spray-on wipe-off Dunlop 65 polish. It's best to just spray some instrument cleaner into your polish cloth rather than coat the ukulele with it. Less is more! And wipe gently, there's usually no need for much power.

How Often to Change Ukulele Strings
This depends on the brand of string and of course, how much you play. Nylon strings don't corrode like the steel strings on a guitar, and they're not hard to keep clean. Aside from damage resulting from nicking the strings with your nails or picks (picks are not typically used on uke) your ukulele strings should last for many months, probably longer.

How to Tie a Knot in your Ukulele Strings
Here are links to two good examples of knots that will work for the ukulele. I'm sure there are more.
Figure 8 Knot
Double Over Knot

How to Store your Ukulele
Your ukulele should have its own case or gig bag to sleep in when you're not playing it. This is the best way to keep it from danger and to help maintain a safe humidity level in your uke. Some players like to display their ukuleles on instrument hooks on the wall, and that's fine if you don't have a low humidity problem during the winter. If your ukes hang on the wall, be sure the relative humidity in your music room is above 40%.

How to Ship your Ukulele
When your ukulele takes a ride on the big truck, it should be carefully packed in a case or gig bag, and inside a heavy corrugated cardboard shipping carton. There should be adequate space inside the box so that no part of the case or gig bag touches the inside of the shipping carton. Crushed newspaper or bubble wrap is best for packing material. Styrofoam peanuts are also popular in shipping but they stick to everything they come in contact with. Newspaper will work as well and you already have some!

How to Buy a Ukulele
Scenario #1: If you're fortunate enough to have a music shop accessible to you that stocks ukuleles, you're a lucky uker and you should support the store that is wise enough to be ready for you. Chances are, If there's a shop with more than 2-3 ukes in stock, there should be a salesperson at the store who can discuss your ukulele needs with you. If not, be sure you've studied up on brands so you are familiar with features, pricing, country of origin and reputation.

Scenario #2: No local ukulele shop? Hit the Internet and do some virtual shopping by Googling ukuleles. Be sure the Internet store you purchase from has a return policy.

Scenario #3: Still not finding what you need? If you're up for some patience and roller-coaster rides, it's time to surf eBay. eBay is an incredible learning ground, and unless you're already knowledgeable about which ukuleles you're shopping for, it's good to spend a few weeks watching ukes sell and get a feel for the highs and lows to expect in price. Try to buy only from sellers that have a 100% feedback rating and have transacted at least a few dozen sales.

How to Sell a Ukulele
If you're selling a nice quality ukulele that has a recognizable name, you'll probably get more on eBay than anywhere else. If you already have several ukes, or you plan to purchase several, seriously consider (at least once in your lifetime) donating your ukulele to someone who will play it and enjoy it, or perhaps donating it to a school or library so that many people can enjoy it.

How to Learn to Play the Ukulele
The million-dollar question! (more later...)

How to Build a Ukulele
The ten-million-dollar question! (more later...)

How to Tune a Ukulele
What Notes?: Modern day tuning is G-C-E-A (with A being the highest pitched note) on soprano, concert, and usually on the tenor ukulele. The tenor can also be tuned D-G-B-E (like the first four strings on a guitar) but requires a set of ukulele strings that support this tuning. The baritone ukulele is tuned D-G-B-E, again like the first four strings on a guitar.

There is an older tuning for the ukulele which is A-D-F#-B, and this tuning is still preferred by many soprano ukulele players. Some older soprano ukuleles that sound dull when tuned to G-C-E-A will really come to life when tuned up a whole note to A-D-F#-B.

How to Get the Notes?: The best way is to use a small electronic tuner, preferably a chromatic tuner. A chromatic tuner has all 12 tones of the scale. There are several small clip-on electronic tuner son the market now that work very well with the ukulele. Look for the brand names Intelli and Meisel in the small clip-on style tuners.

What is Reentrant Tuning All About?
Standard ukulele tuning, when the 4th string is tuned one octave higher than you'd expect, is referred to as reentrant tuning. Legend has it that this is where the phrase "my dog has fleas" comes from, but there seems to be no documented information of when or how the phrase was first used.

UkeTalk correspondent John Kavanagh in Nova Scotia has written an excellent article on the pros and cons of tuning your ukulele with a high 4th or low 4th string. Read John's article here...

How to Keep Your Ukulele in Tune
When your ukulele is new, or when you've just changed your strings, you can expect it to take a few days before the strings will really stay in good tune for you. This usually requires a lot of patience in tuning, playing, tuning, playing...etc. If your ukulele is equipped with friction tuners, you should periodically tighten the small screw on the end of the tuning button. This screw will occasionally loosen up from temperature changes and use. Do not overtighten this screw! Just keep it snug. Always keep a small screwdriver in your ukulele case to ensure that you can make an adjustment anytime you need.

How to Find an Online Ukulele Discussion Forum
Online discussion forums allow viewers to read posts from other players, and after signing up for the forum (free) you may also post questions to others, as well as offer your own opinions of various ukulele subject matter. Discussion forums are an incredible opportunity for learning about the instruments and playing styles. The ukulele discussion forum here on the UkeTalk site is a great resource for players, buyers, sellers and builders. The largest online ukulele forum is the Flea Market Bulletin Board. A great ukulele forum from the UK is called Ukulele Cosmos. Another great forum here in the US is called 4th Peg. Here are the direct links to these discussion boards:
UkeTalk
Flea Market Music
Ukulele Cosmos
4th Peg

How to Convert from Guitar to Ukulele
The quick fix--- If you're already a guitar player and you're starting on the ukulele, we have good news and bad news! The good news--you can use the same chord formations as with the first four strings of the guitar. The bad news-- you're in a different key, since the individual strings are tuned to different notes than the guitar. If you have a little music theory knowledge, the switchover will be fast and easy. If not, you'll have some memorizing to do to keep the chords straight when you're reading from a music book or sheet. If this helps... you're in the same keys as if you capoed your guitar at the 5th fret.