The answer depends on two things we need to know. But before that, a bit of explanation.
Cooling fans come in two types now, for the most part. The older design are 3-pin fans. The motors have 3 wires ending in a connector with 3 holes. The wires are Black, Red and Yellow. The connector has some ridges on one side, and the male (with pins) header on a mobo has a plastic "tongue" sticking up beside its first 3 pins. When you plug in, the ridges fit around the tongue so there's only one way to get them together. The ONLY method of controlling the speed of a 3-pin fan is called "Voltage Control Mode", in which the + VDC power supplied on Pin #2 (Red wire) is varied from 12 (max) down to 5 (min).
The newer fan type is called 4-pin and surprise! it has 4 wires (different color codes) and a connector with 4 holes. The connector design is VERY like that of a 3-pin fan with ridges on one side so that it can plug into the mobo header. A mobo header for this system has 4 pins. Big surprise there, too! In this fan type, Pin #2 has a constant +12 VDC supplied, and the new Pin #4 carries the PWM signal. Inside the fan there is a small chip that uses the PWM signal to modify the flow of current from the +12 VDC supply through the motor windings to achieve speed control. The new design includes backwards compatibility features so the you can plug any 3- or 4-pin fan into any 3- or 4-pin header and they will work. Well, with one important limit: a 3-pin fan plugged into a 4-pin header that uses the new PWM Mode of control will always run at full speed, so you get good cooling but no speed control. The other mis-match (a 4-pin fan connected to a header using Voltage Control Mode) works just fine with speed control and all, but this is not quite as good technically as using PWM Mode to control the 4-pin fan. All fans generate a speed signal (a series of pulses, 2 per revolution, sent back to the mobo on Pin #3 for counting. However, this signal is NOT used for speed control, but it is often used to monitor the motor for failure. The number of pins on the mobo fan header does NOT tell you what method (Voltage Control Mode (aka DC Mode) or PWM Mode) it uses for contrl of fan speed. In fact, most mobos now use 4 pins on all headers, but various methods of fan speed control.
There are two kinds of devices for connecting several fans to a single mobo header. A SPLITTER has one arm with a female fan connector that plugs into a mobo header. Then it has two or more output connectors for fans. All of the fans are merely connected in parallel to the power supply lines from the mobo. Most mobo headers can supply up to 1.0 A total current to all fans connected to that single header, so there's a real limit on how many fans you can handle with a Splitter - often 3 or 4 max with a "normal" fan. Any mobo header can accept only ONE fan's sped signal for counting, so a Splitter (or a Hub) will send back to its header only ONE fan's signal, and ignore all the rest.
A HUB is similar electrically and can have several physical forms. What makes it different, though, is that it has an additional third arm type that must plug into a power output connector from the PSU (either 4-pin Molex or SATA output). THIS is the source of the +12 VDC power for ALL the fans on the hub, and most good hubs will NOT make any connection to the mobo header's Pin #2. Thus the 1.0 A limit on total fan load is avoided. BUT in almost all cases the HUB simply shares the fixed +12 VDC supply and the PWM signal from the header to all its fans. This system depends on using only 4-pin fans with the Hub, because all of the fans MUST be able to use the PWM signal to achieve speed control. (There are one or two Hubs that are different from this.)
When we get to "LED fans" there are some variations. Early designs had one or maybe a few colors of LED, and simply connected them to the +12 VDC supplied to the fan from Pin #2. To some extent the LED brightness changed when the fan was supplied via Voltage Control Mode with reduced voltage on the Pin #2 supply, but they work. HOWEVER, this means that both the fan motor and the LED's are drawing current from the supply, so this has an impact on the load the fan draws from the mobo header, and that is important when considering use of a Splitter. The newest LED fans come with two separate electrical cables. One is strictly for the fan, whether of 3-pin or 4-pin type. The other has a different connector and is strictly for the LED system. What is becoming common is that you get either a LED controller box or you get a mobo with an LED control header, and you connect the LED leads from your fans to those sources. If you have several LED strips or fans with LED cables, you can get a LED Hub which allows control of many LED units from one LED header. They provide both the power for the LED's and control of their lighting effects. With this fan type, the electrical loads of the LED's are NOT involved in figuring out how to control the FAN part.
So, OP, to advise we need to know:
1. What mobo - maker and exact model number - do you have, so we can look up its manual and see what its fan headers can do? Also, whether it has an LED header.
2. What case ventilation fans do you have (or plan to get) - again, maker and exact model numbers for each fan. We can look up how each is controlled and its wiring and current consumption details.
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