Dear Khalid
Please note that LSAs are advertised to different type of areas depend on LSA type.
below table explains in more details:
For more details about SPF principlas, please check below link:http://support.huawei.com/hedex/pages/EDOC1000163385DEG0811X/05/EDOC1000163385DEG0811X/05/resources/dc/dc_feature_ospf_0003.html?ft=0&fe=10&hib=9.3.7.6.2.1&id=dc_feature_ospf_0003&text=Fundamentals%20of%20OSPF&docid=EDOC1000163385
For all details about OSPF:Please read Router product docuementation :
http://support.huawei.com/hedex/pages/EDOC1000163385DEG0811X/05/EDOC1000163385DEG0811X/05/resources/dc/dc_cfg_ospf_0000.html?ft=0&fe=10&hib=9.3.7.6&id=dc_cfg_ospf_0000&text=OSPF%20Configuration&docid=EDOC1000163385