I don't think you can really "learn" from reading about tickling, you kind of have to get out there and let your senses do some acclimating/let your fingers do some feeling. After that the rest is approximating how much it takes to give the tickle. Starting out, I thought tickling was a grabby affair. ..and it can be, until you start testing out for instance how far you can go with one finger on each hand. Then two. Then all 5. Like who would figure you can tickle ribs and other spots easy with your knuckles?
Tickling tips is almost more about properly socializing your tickling fetish than it is touching someone. Which should be kind of simple. Don't seek people out too often, keep chat light (in subject and amount) and when they aren't looking give them a surprise.