Overleaf
Overleaf is a cloud-based LaTeX editor with real-time collaboration capability that can be easily used for creating and publishing documents using LaTeX markup. Official LaTeX templates for Overleaf from a wide range of scientific publications are readily available. For example, Springer Nature LaTeX Template, IEEE LaTeX Official templates, ACM Conference Proceedings Primary Article Template, etc.
Getting started in Overleaf: https://www.overleaf.com/learn/latex/Tutorials
Additional LaTeX Resources
LaTeX is a document preparation system for high-quality typesetting for scientific documents or technical documents and presentations.
LaTeX Documentation: https://www.latex-project.org/help/documentation/
LaTeX Books: https://www.latex-project.org/help/books/
LaTeX step-by-step learning guide: https://www.learnlatex.org/en/