[edit] Overleaf guides

[edit] LaTeX Basics

[edit] Mathematics

[edit] Figures and tables

[edit] References and Citations

[edit] Languages

[edit] Document structure

[edit] Formatting

[edit] Fonts

[edit] Presentations

[edit] Commands

[edit] Field specific

[edit] Class files

You can create subscripts in math mode using an underscore. For example, $x_1$ will make 1 a subscript, and $x_{i+1}$ will make i + 1 a subscript.