What is the use of joining facebook Groups in social media marketing?

Do you know who your typical customer is? Where they hang out? What they like? What they want? That's called creating a buyer persona. Some are obvious (Moms will buy baby clothes, for example). Some are not so obvious (uncles and aunts who have no kids and don't want any will still want to buy baby clothes).

Know this before you do anything else. Platforms and groups are some of the last things to consider in marketing.

You need to write unique and interesting content for people and sometimes post link to your site or where you need to send them!

first of all, you should try to post an effective ad. when you see that people are reaching there you can find the group and also share it.

Not yet. Dead social network

To increase the engagement with Other people

not only facebook, cạn join some popular website to add any SEO , Social Media group like Facebook,Instagram,Twitter,Pinterest,Linkedin,YouTube

Firstly you must have information about your Ideal customer. (Suitability of customer with a product).Then you have to find groups where you can reach your customer. Then you can get your targeted customer by joining the Facebook Groups.

Facebook groups are great for getting to know your potential customers. They generally share their problems and that allows you to come up with a "fix" for those problems so you build authority as an expert in your niche.
This helps with developing the like and trust factors that you need to succeed in doing business on the internet.

Facebook groups bring together individuals who share a common interest. When you join a group that’s made up of people who match your target customer, you’ll have multiple opportunities to improve awareness of yourself and your business by being helpful.

To reveal those opportunities, simply type a keyword or topic into the search box on the right-hand menu of the group’s page.

If you type the search term
If you type the search term “Facebook ads” inside a group, you can see all posts related to that topic.
You’ll see that people are asking a lot of questions inside groups. Find the questions that will let you demonstrate your expertise or specialized skills. You can answer the questions outright, share a helpful blog post, or even mention your own products and services.

Posts like this one are a perfect opportunity to provide a solution to another group member.
Posts like this one are a perfect opportunity to provide a solution to another group member.
This kind of marketing is very powerful because it’s highly targeted. People need answers to their questions and if you can provide solutions on a regular basis, you and your business will start to become top of mind with members of the group. People may even start to look to you for answers by tagging you in comments.

You can also use these searches to gather FAQs and create original content for your potential customers.

How Do I Find Groups on Facebook?
Think of groups run by other people as mini-communities. There’s a group for virtually anything and everything, and you can join up to 6,000 groups. Here’s how you can join a Facebook group or two, and engage daily with other members.

Log into your Facebook personal profile account and find Groups on the left-hand side of your Home page in the Explore section.

Access Facebook Groups from the Explore section of your Facebook personal profile.
Access Facebook Groups from the Explore section of your Facebook personal profile.
Once you click on the Groups tab, you’ll automatically be sent to the Discover Groups landing page. This is where Facebook suggests groups for you based on criteria such as pages you’ve liked, groups your friends are members of, and so on. Facebook will also let you see which of your friends are members of the groups suggested to you.

Browse the Discover Groups page to find groups that will likely include people matching your target customer.
Browse the Discover Groups page to find groups that will likely include people matching your target customer.
As you browse through the suggested Facebook groups, you’ll see both public and closed groups.

Hover over any group name to see whether it's an open or closed group.
Hover over any group name to see whether it’s an open or closed group.
Click on any group to learn more about it by reading the description to understand the group’s mission. Be sure you’re a fit before you ask to join.

Many group owners will also post specific rules for engaging inside the group. Rules are often posted in the Description area or in a post that’s been pinned to the top of the timeline. It’s important to read the rules so you don’t get barred from the group.

Here's an example of Facebook group rules.
Here’s an example of Facebook group rules.
Once you find a group to join, just click the Join button. Be aware that some groups, like this one, will ask you to answer a few entry questions before sending your request along to the group owner.

Some group owners will ask you to answer some pre-qualifying questions when you join.
Some group owners will ask you to answer some pre-qualifying questions when you join.
After you answer the questions, you’ll get a message letting you know that your request is pending and you’ll get a notification when your request to join has been approved.

You'll get a notification that your request to join a group has been received.
You’ll get a notification that your request to join a group has been received.
When the group is opened to you, spend some time looking through the posts to get a feel for how it operates. Once you understand the tone of conversation, and the way other members ask and answer questions or offer advice, you’ll be able to successfully do the same.

There's nothing quite like lifting someone else's hard work and pretending it's your own, eh?
https://www.socialmediaexaminer.com/facebook-groups-for-business-how-to-guide-for-marketers/

In Facebook for joining the facebook groups is important for marketing, form that we can target in one shot many customers. and we take the suggestion from the customer or members of groups.
It helps for offering discussion
inbound marketing trips we can collect from groups
expand work with personal & professionally
build community in business and brand of business

Yes, of course, social media marketing in groups is useful.
Public groups can attract people who join simply to spam other members with their own content. If you decide to build a Facebook group community around a certain topic or event, a public group may work well.