Below is just a small selection of textbooks and handbooks relating to these topics–many more exist!
Fieldwork and documentation
Open Handbook of Linguistic Data Management and accompanying course (Berez-Kroeker, et al., eds.)
Methodologies in Semantic Fieldwork (Bochnak & Matthewson, eds.)
Linguistic Fieldwork: A Practical Guide (Bowern)
Handbook of Descriptive Linguistic Fieldwork (Chelliah & deReuse)
Essentials of Language Documentation (Gippert, Himmelmann, & Mosel, eds.)
The Use of Archives in Endangered Language Preservation (slides)
Revitalization
Revitalizing Endangered Languages (open source) (Olko & Sallabank, eds.)
Indigenous research methodologies, teaching, and learning