You will usually find four tiers of options. Private language schools offer intensive or evening courses with small groups and flexible start dates; they are the fastest route but the priciest. Universities often run semester-long courses for foreigners, sometimes open to non-students, with solid structure and recognised certificates.
Then there are the budget-friendly community options: many cities have adult education centres, community colleges, or municipal integration programs with heavily subsidised classes for newcomers, and some countries fund free or discounted language courses for new residents as part of integration policy, so check whether your visa category qualifies. Libraries, cultural institutes, and religious or community organisations frequently host free conversation classes too.
If you need a certificate for residency or citizenship later, confirm the course prepares you for the officially recognised exam before enrolling. And whatever you choose, pair classes with real-life practice, since two hours a week in a classroom alone will not get you conversational.