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It looks like you have not selected the necessary desktop components during the installation. How did you install the Gnome desktop and which package groups did you select or not select?
Anyway, keep in mind that Enterprise Linux distributions, including Oracle Linux are not designed for Laptops. Support for wireless will generally be limited and will likely require 3rd party software drivers. If you have a reasonable Laptop with at least 4 GB of RAM and a modern x86_64 CPU with hardware virtualization support I highly recommend to install a product like Oracle free Virtualbox. With Virtualbox, the network connection (wifi) will be established by the primary OS, e.g. Windows or Mac OS X, and passed over to your Guest OS, e.g. Oracle Linux as a simple Ethernet adapter.
Try this from a shell:
yum install NetworkManager-gnome
It will configure your system for installation/updates through the Oracle public YUM repository and install the Gnome NetworkManager applet, pulling in dependencies when needed.