If it's a math class, teach 2 + 2 = 4 and how to get there. Teaching kids practical applications of math is good. Scrap everything that constitutes social engineering unrelated to math problems.
In science class teach ALL the theories of the origins of the the universe and why science strongly leans toward one of those. Teach evolution but explain that it can't answer every question. In teaching climate change, provide all the pertinent important information including why some scientists do not agree with others, what the points of disagreement are, what predictions have come true and which ones have not. Allow the students to think critically about what they learn.
In History Class teach all the history, the good, the bad, the ugly. Regarding slavery teach the roles the Portuguese, British, French, Dutch, Spanish, African nations etc. played in addition to the Americans--and all the efforts to end slavery and segregation and what it cost people who were involved in that. No curriculum that teaches white children that they are racist and black children that they are victims, i.e. no CRT. No sexual content of any kind for children younger than adolescent other than you are a boy and you are a girl--here's the boys' bathroom and here's the girls' bathroom. Pronouns should be he, she, her, him or our or they for groups. The teacher should take no firm position but should encourage the students to think critically about what they learn.
That's for starters.