Lol guys I could say so many things but bro…
Philip basically “timelines” are used in different ways.
One is for example in the daniel papers where he writes about 3 main timeline i think.
Then you have for example tessaract magic where you “shift” through (in theory, never tried, not planning to lol, the warning in the book is that you should only try under the same circumstances as you would commit suicide) and end up “somewhere”. So basically your surrounding and most importantly people and their personalities could change drastically.
This is the no covid type of version and i have never read about an approach where you can really be sure about your “destination world”. Or where you could really shift back easily if you wanted to. for example bc the third reich won the war but you dont speak german
Then there is a new age-y approach which is a fancy name for manifestation.