including the use of face masks and other personal protective equipment in such settings, (B) training and professional development on health and safety practices related to the prevention of COVID-19 transmission in child care provider settings, (C) the acquisition and use of personal protective equipment, and (D) modifications of child care provider settings and services to prevent COVID-19 transmission, such as optimal staff-to-child ratios across such settings and the use of mental health supports. (2) Materials As part of such technical assistance efforts, the Secretary shall— (A) publish educational materials related to the prevention of COVID-19 transmission in child care provider settings, including by posting such materials on a website, (B) update any such materials as necessary to reflect advancements in the science of COVID-19, and (C) provide a mechanism through which States may exchange best practices relating to the safe operation of child care providers. (b) Technical Assistance to Child Care Providers (1) In general The Secretary may make grants to lead agencies designated under section 658D(a) of the Child Care and Development Block Grant Act of 1990 ( 42 U.S.C. 9858b(a) ) to provide guidance, technical assistance, and support to child care providers, either directly or through resource and referral agencies or staffed family child care networks, regarding the safe operation of child care providers while there is community transmission of COVID-19. (2) Reservation The Secretary shall reserve 2.75 percent of funds appropriated to carry out this section to make payments to Indian Tribes, Tribal organizations, or consortia of Indian Tribes and Tribal organizations. (3) Allotments From amounts appropriated to carry out this section and not reserved under paragraph (2), the Secretary shall allot to Guam, American Samoa, the Virgin Islands of the United States, and the Commonwealth of the Northern Mariana Islands and to the remaining States amounts in accordance with subsections (a)(1) and subsection