The Arduino IDE 2 is a major leap forward from the v1.x.x series. In addition to IDE 2 having a slick new User Interface. Arduino has also introduced awesome new features that will drastically improve your coding experience on the platform.
The LM35 ICs are a series of precision temperature measuring sensors. LM35s are very popular among members of the Arduino community. Their popularity is a direct result of the sensors being easy to setup and easy to interface with the Arduino development environment. Common members of LM35 IC series include the LM35C and the LM35D.