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I was trying to say
I'll give you a chance when I learn to love again
I thought that I have to say something like
再び愛することを学んだら...何かする
because that time of learn how to love again will come for sure and if I remember accurately that it was the only condition to use たら as "When.." but this other sentence come to my mind too
再び愛することを学んだときに...何かする
and now I'm really confuse if there are equivalents, if there are a correct one and which? and why the other is wrong?
たら can be hypothetical (i.e., "if"), but たときに cannot.
Likewise, depending on the context, 学んだら can sound like you may or may not learn something in the future. You can usually tell if a certain たら is hypothetical from the context.
That said, 学ぶ is usually used in educational contexts, and 再び愛することを学ぶ already sounds a little weird to me. Isn't something like 再び愛せるようになったら (or なったときに) enough?
たら indicates that something happens, as described in the main clause, when the circumstance described in the subordinate clause (i.e. before たら) comes true. If it is likely to happen, たら is usually translated with when in English, and if it is less certain, it may be translated with if. This is a distinction English makes. In Japanese, the basic idea is the same regardless of the likelihood.
The difference from 〜た時に is that it puts focus on a (usually one-time) condition rather than timing. For example, when you say 再び愛せるようになったら, you mean that you learning to love again is a necessary condition for doing whatever is stated in the main clause. In general, when you talk about such a condition, you are either consciously or unconsciously thinking about a possibility of it not being met. When you say 再び愛せるようになった時に, on the other hand, you are more likely assuming that that time will come.
