Personal organization:
(1) Use the Windows file system to create a directory ("folder") tree that is often a taxonomic hierarchy. Have some good little command line tree walking commands.
(2) Do a lot with just text in simple text files. Generally prefer just simple text. Manage these files with a really good text editor. Have a lot of macros for the editor. E.g., start each entry in a file with a time, date, day of week stamp from a macro -- good to have to document the entry even if don't have much more.
(3) In each directory, have a text file that describes the other files or directories in that directory.
(4) Have a file, I call FACTS, just a text file, that has little facts: Each entry starts with a delimiter line, then a time-date line, then a line of keywords, and then the entry. The entries have user IDs, passwords, credit card info, e-mail addresses, USPS addresses, phone numbers, URLs of interesting Web locations, names of people and/or notes on them, etc. really just lots of short facts. Write a little editor macro to do search keywords.
E.g., since this thread likely has better ideas than I have, I put the URL of this thread in FACTS!
Big point: A single file of a few million characters searches essentially instantly and can hold lots of facts per day for years!
(5) For more, that is, for more serious information, knowledge, etc., write notes, even nice papers in D. Knuth's TeX and index them in FACTS, describe them in the documentation file of directory of the paper, etc.
For what to share with others, I'd suggest relatively well written notes or papers. For more, have a directory, make a ZIP file of the whole directory, and share that. For more, maybe use GITHUB or some such.