open source licenses, a confusing and contentious topic, some treat it like a religion, but it should probably be treated as a tool, choose the right one for the job
choose a license is a great resource
tl;dr legal is also nice
If your goal is to share your work with little care for how it is used, and not participate in religious evangelism, MIT or BSD-3 hits the sweet spot between formality and freedom
Listed below is generally in order of leat to most restrictive.
Do what you want, disclaims copyright
same as CC0
do what you want, just keep this (combined) license and copyright notice
same as MIT
same as MIT express prohibition of using project / contributors name without permission
same as MIT express grant of patent use by contributors
copyleft, source + mods of originally MPL code must remain available under MPL or stricter, source can be copied into other projects
copyleft, source + mods of originally LGPL code must remain available under MPL or stricter can only be dynamically linked by other projects
copyleft, source + mods + build + install of entire derived work must remain available under GPL-2 or stricter
GPL-2, plus patents
GPL, but includes everything over the network