Irregular verbs in foreign languages can be very difficult to learn. Make it easy for yourself by putting them on Wozzol. If you make some nice context sentences to go with them, it’ll be even easier.
Look here for a good example of a list of English verbs with the irregular verbs in as well. If you learn this list, you’ll have no further trouble with the irregular verbs. The list is easy to learn because there are so many hooks to help you secure the knowledge well in your long-term memory. You can, of course, make similar lists in other languages.