Welcome back! This forum has many low carb plans (see top banner, plans at https://forum.lowcarber.org/index.php? ) but the most popular is the Atkins plan, first published in 1972. A classic, this thread about the induction phase is pinned at the top of the Atkins forum:

https://forum.lowcarber.org/showthread.php?t=236482

All the best,