I have this board and it is the first time I work with it. How can I connect 2 elements in it, and how to solder IC with all the circuit lines that connect all the elements.
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If the back side have square metal pads around each hole you can solder it with wires or tons of lead there. Just put the component terminals through holes from this side and solder them from that side.
However it is not convenient board anyway.
If the back side has metal pads in form of strips joining several holes, it is bit better - you need to cut them with a knife in proper places...
However if you are not building prototype, I recommend you to get:
(google for the further details)
I know this sounds frightening at first sight, but after you try you'll find it is far easier for rather than messing with such "prototyping" boards - and the device you get is far more robust.
You leave component leads fairly long, and bend them over or loop them around to connect to the next part - where needed for longer runs, you use additional insulated wires on the component side, but for the most part there's plenty of lead-wire to connect between pads for each node.
Not surprisingly, this method is shown in an answer at the question linked as a possible duplicate; though that also seems to be in favor of "pure solder bridging" which I'm not in favor of - use a wire and solder, not just solder.