Is solving leetcode problems in local ideal?

I am a beginner and I solve problems on intellij (java) better than i solve the problems online, as it gives me the syntax errors prior and allows to fix it. Also I can see what methods a library offers. Am I going in the right direction?? or will this practice harm me? EDIT: my libraries i mean the general ones, like methods offered by hashmap, streams api, comparator, collections, etc..