Strong or irregular verbs are verbs that form the stem forms by vowel change as fliegen flog geflogen. The verbs that are the most frequently used are irregular. In lists of dictionaries there are about a hundred.
Weak or regular verbs are verbs of the type machen machte gemacht. Most verbs are regular.
There is a mixed type with endings and vowel change as bringen brachte gebracht. About a handful. They are of course irregular, too.
What you really need is a list of irregular verbs. It is easy to see whether it is type 1 or the mixed type.
I've just had a look at some lists of irregular verbs (IV) online. It is easy to see that those who made those lists never learnt from such lists as a learner would. For learning purposes these lists a worthless.
What a learner needs are three forms as
fliegen flog *geflogen ( perfect with sein, verb of movement)
reiten ritt *geritten
sprechen* sprach gesprochen ( present tense with vowel change).
bringen brachte gebracht
The subjunctive forms should be added in a list "IV with subjunctive"
- kommen kam *gekommen - (subjunctive:) er komme, er käme.
You see there is still a lot to learn for people who write grammars and make lists.
Almost all lists of IV are edited negligently. You never see an introduction to these lists which would inform a learner what he or she has to know about IV.