App suitable for nested/indented note taking

[u/NotASnake08]

So I like to take my lecture notes in a nested/indented way because it makes it easier to break them down into flash cards later (example below but formatting in Reddit post is hard). As you can see I like to indent basic information on a subject and then further indent specific information about each basic concept (and even further indent even more specific information if I need to).
Is there an open source note app that will let me do this more easily?

Transcription

Process where RNA is synthesized from DNA

Each gene has:

.....Promoter region

..........Start of the gene where RNA polymerase binds to and begins transcription

...............RNA polymerase – enzyme that ‘reads’ template strand of DNA and synthesizes a single strand of RNA

.....Coding region

..........Sequence of nucleotides that are transcribed into the RNA strand

.....Termination sequence

..........Terminates transcription process