Hi guys. Maybe you're tired of newbie questions but don't misunderstand me. For example, I have three modules and they're supposed to be connected to 5V (or GND). Can I connect several wires at once in only one 5V? If the answer is yes but how can I do it? Should I unite three wires in one? Thanks in advance.
((The image is just for example))
The answer is yes
One way to do it is to use a solderless breadboard. One wire from the 5V pin to the breadboard and as many wires from the breadboard to devices as required
You do not say which Arduino you are using but the image shows a Nano for which these are another solution to your problem
https://www.amazon.co.uk/Prototype-Shield-Expansion-Extension-Arduino/dp/B00TQQICD6
If you want to make a permanent connection then soldering multiple wires to a single pad can work and don't forget that there is a 5V pin on the ICSP connector
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and same applies to GND (better have a star approach than daisy-chaining the GND from device to device)
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Hi, appreciate your reply. Unfortunately, I don't want to use a shield. So, I can solder them and there won't be any problems with that?
no problem from the soldering itself. Just make sure you don't draw more current from this pin that it can provide.
➜ so it depends on what is connected
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Is there any max volt value that I can connect??
the pin provides 5V and you connect in parallel so all the devices will see 5V
The limit is on the current: the maximum the on-board regulator can provide is 800mA. However the actual amount it can really provide at any time depends on other external factors such as how you powered your board (voltage of your supply), ambient temperature or heat dissipation for the regulator for example.
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That will depend on how good your soldering is so I cannot provide any guarantees about possible problems. The fact that you had to ask the question implies that your electronics experience, and hence soldering experience, is limited. Please accept my apologies if that is not the case
There is another consideration and that is how much current your project will take from the 5V pin. Exactly what are you intending to power from that pin and how will the Arduino itself be powered and don't forget the need for a the connected devices need a common GND connection
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Thank you!
Thanks 
So that diagram will not work at all as there are at least two ground connections missing. 
Well, we guessed, but the point is there. People forget that the "ground" (negative) is the most important connection.
There is no need to delete posts; use the edit function - the "pencil" icon below the post.
For a second or two at most. It is most unwise to attempt to power via "Vin"; use a 5 V power supply connected - also - to the 5 V pin. 
You can to some extent provide power via the USB connector but the display may not work as effectively.
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