Hello friends , i am new to all this and also my English isn't very good but ill try to explain what i wont to build with Arduino. I know it will be hard right my question is can i build temperature and humidity logger and monitoring thanks
Yes you can. You can use, for example an DHT11 and save the values in a SD card.
right , that's enough this will save all data in to SD memory card , can i just connect it to desktop PC and monitoring them online via software for connected with Arduino , i guess that's the hardest way ...
No it isn't. It's the easiest way. You can send the stuff to a freebie terminal programme, like RealTerm, and record it on PC. RealTerm will even timestamp each reading, using the PC clock.