If you want to save simple product using programming use below code

1. Create file in magento 2 root named saveproduct.php

2. Put below code in saveproduct.php file

<?php

	use MagentoFrameworkAppBootstrap;
	include('app/bootstrap.php');

	// add bootstrap
	$bootstraps = Bootstrap::create(BP, $_SERVER);
	$object_Manager = $bootstraps->getObjectManager();

	$app_state = $object_Manager->get('MagentoFrameworkAppState');
	$app_state->setAreaCode('frontend');

	// get date 
	$today_date = date("m/d/Y");
	$added_date = date('m/d/Y',strtotime("+17 day"));

	$set_product = $object_Manager->create('MagentoCatalogModelProduct');

    $set_product->setWebsiteIds(array(1));
    $set_product->setAttributeSetId(9);
    $set_product->setTypeId('simple');
    $set_product->setCreatedAt(strtotime('now')); 
    // time of product creation
    $set_product->setName('Test Sample Product 2'); 
    // add Name of Product
    $set_product->setSku('add-sku-2');
    // add sku hear
    $set_product->setWeight(1.0000);
    // add weight of product
    $set_product->setStatus(1);
    $category_id = array(4,5);
    // add your catagory id
    $set_product->setCategoryIds($category_id); 
    // Product Category
    $set_product->setTaxClassId(0); 
    // type of tax class 
    // (0 - none, 1 - default, 2 - taxable, 4 - shipping)
    $set_product->setVisibility(4); 
    // catalog and search visibility
    $set_product->setManufacturer(28); 
    // manufacturer id
    $set_product->setColor(24);
    //print_r($_product);die;
    $set_product->setNewsFromDate($today_date); 
    // product set as new from
    $set_product->setNewsToDate($added_date); 
    // add image path hear
    $imagePath = "img/sony.png"; // path of the image (e.g pub/media/<image folder>)
    $set_product->addImageToMediaGallery($imagePath, array('image', 'small_image', 'thumbnail'), false, false);
    // product set as new to    
    $set_product->setCountryOfManufacture('IN'); 
    // country of manufacture (2-letter country code)
    $set_product->setPrice(100.99) ;
    // price in form 100.99
    $set_product->setCost(88.33); 
    // price in form 88.33
    $set_product->setSpecialPrice(99.85); 
    // special price in form 99.85
    $set_product->setSpecialFromDate('06/1/2016'); 
    // special price from (MM-DD-YYYY)
    $set_product->setSpecialToDate('06/30/2018'); 
    // special price to (MM-DD-YYYY)
    $set_product->setMsrpEnabled(1); 
    // enable MAP
    $set_product->setMsrpDisplayActualPriceType(1); 
    // display actual price 
    // (1 - on gesture, 2 - in cart, 3 - before order confirmation, 4 - use config)
    $set_product->setMsrp(99.99); 
    // Manufacturer's Suggested Retail Price
    $set_product->setMetaTitle('test meta title 2');
    $set_product->setMetaKeyword('test meta keyword 2');
    $set_product->setMetaDescription('test meta description 2');
    $set_product->setDescription('This is a long description');
    $set_product->setShortDescription('This is a short description');
    $set_product->setStockData(
        array(
        'use_config_manage_stock' => 0, 
        // checkbox for 'Use config settings' 
        'manage_stock' => 1, // manage stock
        'min_sale_qty' => 1, // Shopping Cart Minimum Qty Allowed 
        'max_sale_qty' => 2, // Shopping Cart Maximum Qty Allowed
        'is_in_stock' => 1, // Stock Availability of product
        'qty' => 100 // qty of product
        )
    );

    $attr1 = $set_product->getResource()->getAttribute('manufacturer');
    $avid1 = $attr1->getSource()->getOptionId('Sony'); //name in Default Store View
    $set_product->setData('manufacturer', $avid1);

    $attr2 = $set_product->getResource()->getAttribute('color');
    $avid2 = $attr2->getSource()->getOptionId('White'); //name in Default Store View
    $set_product->setData('color', $avid2);
    
    $years = array('India','Dubai','London', 'America', 'Indonesia');
    $attr3 = $set_product->getResource()->getAttribute('available_in')->getSource();
    $valuesIds = array_map(array($attr3, 'getOptionId'), $years);
    $set_product->setData('available_in', $valuesIds);


    $set_product->save();
    // get id of product
    $get_product_id = $set_product->getId();
    echo "Upload simple product id :: ".$get_product_id."n";

?>

Here I have used attributes and category as per my requirement, So you should use attributes and category as per your requirements.