some xblig xna monogame dev links
From XNA to MonoGame
https://www.gamedeveloper.com/programming/from-xna-to-monogame
XNA 3.1 to XNA 4.0
https://speciesdevblog.wordpress.com/2018/03/10/xna-3-1-to-xna-4-0
kewlniss / XNAUnleashed
https://github.com/kewlniss/XNAUnleashed
Upgrading XNA 3.1 to XNA 4.0 / MonoGame 3.5.1 / Universal Windows Platform
https://www.youtube.com/watch?v=zJZNqaG2Hsg
Shawn Hargreaves Blog Index
https://shawnhargreaves.com/blogindex.html
XNA 3.1 to XNA 4.0 CheatSheet
https://nelsonhurst.com/xna-cheatsheet/
Managing Content
http://rbwhitaker.wikidot.com/monogame-managing-content
elennick / switch-xna
https://github.com/elennick/switch-xna
Converting a game from XNA 3.1 to Monogame 3.5
https://www.reddit.com/r/monogame/comments/5ckw7t/converting_a_game_from_xna_31_to_monogame_35/