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How to add a form inside a specific layout?

I am not that PRO using WindowsForms because I do not use them too much but right now I am developing a Inventory system so this is my approach(design):
I have used 3 FlowLayoutPanels, I am trying to show various Forms inside FlowLayoutPanel3 when clicking specific button in the left panel the flowlayoutpanel3 will show/trigger the specific form.
What I have tried?, well I have read that I can use MDI container and stuff like that but I noticed that it is a different approach because I do not want to show a separate window, just just inside the flowlayoutpanel3 and maximized.
I have been googling solutions but could not find a solution. * OR is there any item in the toolbox to perform this kind of stuff?*
PD: I am using VS2019 and C#.

Create the new form, set it's TopLevel to false, add it to the panel controls and maximize it:
var frm = new Form(); //Or whatever form type you want to use.
frm.TopLevel = false;
frm.FormBorderStyle = FormBorderStyle.None;
flowLayoutPanel3.Controls.Add(frm);
frm.WindowState = FormWindowState.Maximized;
You may need also to make it visible
frm.Visible = true;

How can I add wpf form inside windows forms tabpage?

When clicked show button I show win form inside tabcontrol which elements of win form, but I can not add wpf form inside this tabcontrol;
Faturalar() is the win forms;
Fatura.Faturalar ftr = new Fatura.Faturalar();
ftr.TopLevel = false;
ftr.Visible = true;
ftr.FormBorderStyle = FormBorderStyle.None;
ftr.Dock = DockStyle.Fill;
tabControl1.TabPages[0].Controls.Add(ftr);
it works but;
MainWindow is wpf forms;
MenuYonetimi.MainWindow mny = new MenuYonetimi.MainWindow();
tabControl1.TabPages[2].Controls.Add(mny);
it doesn't allow to do

Top-level Windows cannot be contained inside other Windows or "form"s if you want to call it that. If you need WPF content inside a winforms app you will need to place an ElementHost inside the form and place your WPF UI (probably in a WPF UserControl). But there's no way that any form or window will contain another Window.

Show WPF control instead of MessageBox

I have a modal created for a WinForm that shows when user click the "Save" button. Instead of showing the MessageBox, I want to know if it's possible to incorporate a WPF control I've created instead? Here's my code.
Form frmModal = new Form();
frmModal.BackColor = Color.Black;
frmModal.WindowState = FormWindowState.Maximized;
frmModal.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
frmModal.Opacity = 0.6;
frmModal.Show(); //--> want to replace with WPF control
MessageBox.Show("Hello");
frmModal.Close();
frmModal.Dispose();

Yes you will need to bring up a new form window which uses a winform ElementHost control to show the WPF control.

Yes, you can use the customized WPF control in place of MessageBox, you can have a fairly good idea how to do it by referring to this CodeProject article for details: A Customizable WPF MessageBox
Hope this is what you are looking for.

Displaying a form within another form

I am building a web browser application using c# and the awesomium web framework . I have a form containing a dock panel within which I would like to display another form that holds the awesomium web-control . Basically the parent form facilitates creating tabs and the one with the webControl has the browsing engine and is rendered within the tabs .
Is this possible ? If yes , can you give me some tips on how to.

You can embed a form in another control if set TopLevel = false;
private void EmbedForm()
{
Form f = new Form();
f.TopLevel = false;
f.BackColor = Color.White;
f.FormBorderStyle = FormBorderStyle.None;
f.Dock = DockStyle.Fill;
f.Visible = true;
panel1.Controls.Add(f);
}

Move common UI content to UserControl and use it in a both form.
It is a most common practice.

Windows Forms UserControl + Panel: WPF Equivalent

In Windows Forms, I have created a Twitter application that gets the latest tweets from the Timeline using TweetSharp. I have used a UserControl and a Panel to display these. The code I've used to do this looks like this:
IEnumerable<TwitterStatus> tweets = service.ListTweetsOnHomeTimeline();
foreach (var tweet in tweets)
{
TweetBox t = new TweetBox();
t.username.Text = tweet.User.ScreenName; // Label
t.display.ImageLocation = tweet.User.ProfileImageUrl; // PictureBox
t.tweet.Text = tweet.Text; // Label
t.info.Text = tweet.CreatedDate.ToString();
t.Dock = DockStyle.Top;
HomeTimeline.Controls.Add(t); // Add to HomeTimeline Panel
}
I'm now re-making this application in WPF. The UserControl is in the same format, but I'm clueless as of how to add this to the panel and dock it to the top - or the equivalent in WPF. How do I do this?

A WinForms UserControl are not the same as a WPF UserControl.
You'll have to make the UserControl again, in WPF.
Of course, you could wrap the WinForms UserControl in a WindowsFormsHost element, but that's not good practice.