Answers for "laravel more foreign keys on the tableuse table with custom name laravel"

laravel foreign key

Schema::table('posts', function (Blueprint $table) {
    $table->unsignedBigInteger('user_id');

    $table->foreign('user_id')->references('id')->on('users');
});
OR
Schema::table('posts', function (Blueprint $table) {
    $table->foreignId('user_id')->constrained();
});

laravel before migration

Schema::table('users', function ($table) {
    $table->string('email')->after('id')->nullable();
});