While I think it's encouraging that you are paying close attention to your credit and finances, remember this is a marathon, not a sprint. Getting rewards for spending is good, but unless you are ThePointsGuy and do this for a living, the best way to have money for traveling for most people is still to save or to earn money. I know it's probably not what you want to hear and I know those sign up bonuses and rewards are very tempting, but chances are unless you can put some decent spending through your card you won't be accumulating points at a fast enough clip to do much travel based off that alone.
tl;dr: do continue to build your credit, aim for the rewards cards, and be responsible. But, if you want to travel, the fastest way is to find a side job and save money.
Just use those two cards responsibly and pay in full each month. Credit isn’t a sprint it’s a marathon. I’d wait for 12 months of use on both cards and then try to get them unsecured. Once that happens and you show you can pay your cards I. Full, then I would try for a third card. I see too often in here people try to go so fast that they get in financial trouble with cards. You have a good start on your credit journey. Remember pay in full every month. Paying interest on credit cards is a pathway to disaster.